Document:

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                                                                   Exhibit 10(i)

                               ESCROW AGREEMENT

     ESCROW AGREEMENT (this "Agreement"), dated as of October 31, 2001, by and
among Enviro-Clean of America, Inc., a Nevada corporation, the principal place
of business of which is located at 1023 Morales Street, San Antonio, Texas 78207
("Company"), Randall K. Davis, an individual, who has been appointed Agent and
Attorney-In-Fact for certain purchasers of the Company's promissory notes and
whose principal place of business is located at 1023 Morales Street, San
Antonio, Texas 78207 ("Agent") and Randall K. Davis as the escrow agent (the
"Escrow Agent"):

                                   Recitals

     WHEREAS, the Company holds title to certain shares of common stock, par
     value $0.01 (the "Common Stock"), of IVAX Diagnostics, Inc., a Delaware
     Corporation ("Diagnostics");

     WHEREAS, from time to time before, on and after the effective date of this
     Agreement, the Company will issue promissory notes to private investors
     (all such notes, whenever created or issued being referred to herein as the
     "Notes") in a private offering (the "Offering") pursuant to that certain
     private placement memorandum dated August 23, 2001 (the "Memorandum");

     WHEREAS, the Company has agreed to grant a security interest in certain
     shares of Common Stock of Diagnostics (the "Diagnostics Shares") in favor
     of the private investors in order to secure the payment of all Notes
     whenever issued pursuant to that certain security agreement of even date
     with this Agreement among the Agent and the Company (the "Security
     Agreement") and Agent has been appointed by the private investors to act as
     their sole Agent and Attorney-in-Fact in all matters pertaining to the
     security interest in the Collateral pursuant to that certain agency
     agreement among the holders of the Investor Notes, Secured Party as agent
     for the holders of the Notes, and Debtor (the "Agency Agreement"); and

     WHEREAS, the Company has agreed to deliver the Diagnostics Shares to the
     holders of the Notes (the "Holders") to ensure perfection of the security
     interest by delivering the Diagnostics Shares and appropriate stock powers
     (the "Stock Powers") to an escrow agent to hold for the benefit of the
     Holders. This Agreement, the Agency Agreement, the Notes, the Security
     Agreement and all other documents and instruments executed in connection
     herewith or therewith, are collectively referred to as the "Offering
     Documents."

     NOW, THEREFORE, in consideration of the purchase of the Notes by the
private investors, the premises and the agreements herein contained, and other
good and valuable

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consideration, the receipt and sufficiency of which is hereby acknowledged,
Company, Agent and Escrow Agent hereby agree as follows:

     1.   Delivery of Diagnostics Shares.

     Upon the Final Closing of the Offering (as defined in the Memorandum), the
Company shall deliver to the Escrow Agent a number of Diagnostics Shares with an
aggregate Fair Market Value (as defined below) equal to 125% of the total
aggregate face value of the Notes purchased pursuant to the Offering. In
addition, the Company shall deliver to the Escrow Agent appropriate Stock Powers
in favor of the Holders. The delivery of the Diagnostics Shares and Stock Power
to the Escrow Agent is intended by the Parties to be a delivery of the
Diagnostics Shares to the Holders and is intended to give the Holders full
control of the delivered Diagnostics Shares, in order to perfect a security
interest as described in the Texas Business and Commerce Code.

     The "Fair Market Value" per share of Common Stock of the Diagnostics Shares
shall be equal to the average of the closing price per share of Common Stock of
Diagnostics as reported by The American Stock Exchange or such other securities
exchange, market or quotation system on which Common Stock of Diagnostics is
then listed for trading or quoted on each of the ten (10) trading days prior to
the date hereof or each Value Review Date (herein defined) as the case may be.

     2.   Terms of Escrow.

          (a) The Escrow Agent shall hold the delivered Diagnostics Shares in
escrow pending notice from the Agent directing the Escrow Agent to release the
Diagnostics Shares and Stock Power to the Company, subject to the adjustments
described below. The Company shall deliver written notice of the total amount of
Notes outstanding (the "Outstanding Note Amount") to the Agent, at least five
(5) days prior to each of the Value Review Dates, as defined in this Section 2.
On January 1, April 1, July 1, and October 1 of every year during the term of
the Notes, so long as any Notes remain outstanding (the "Value Review Dates"),
the Escrow Agent shall calculate the number of Diagnostics Shares which Fair
Market Value would equal 125% of the Outstanding Note Amount on such dates. The
Agent shall then give notice on that day, by phone, electronic mail, facsimile
or any other delivery method, to the Escrow Agent and the Company (each such
notice being referred to herein as an "Agent Notice"). Each Agent Notice shall
specify (1) the Fair Market Value per share of the Diagnostics Shares and (2)
the number of Diagnostics Shares with a Fair Market Value that is 125% of the
Outstanding Note Amount, (3) the number and Fair Market Value of Diagnostics
Shares currently held by the Escrow Agent for purposes of this Agreement, (4) if
the Fair Market Value of the Diagnostics Shares held by the Escrow Agent exceeds
125% of the Outstanding Note Amount (the "Excess Amount"), the total Excess
Amount and the number of Diagnostics Shares with a Fair Market Value equal to
the Excess Amount (the "Excess Shares"), and (5) if the Fair Market Value of the
Diagnostics Shares held by the Escrow Agent is less than the Outstanding Note
Amount ("Deficit Amount"), then the total Deficit Amount and the number of
Diagnostics Shares with a Fair Market Value equal to the Deficit Amount (the
"Deficit Shares"). The Escrow Agent shall

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<PAGE>

be entitled to rely completely on the Agent Notice and shall be under no duty
whatsoever to make any calculations regarding any of the calculations made
therein.

          (b) Upon receipt of an Agent Notice by the Company in which there is
an Excess Amount, the Company may request that the Escrow Agent deliver all or
any portion of the Excess Shares to the Company by sending a written notice of
request to be delivered to the Escrow Agent ("Company Request") within three (3)
days of a Value Review Date. Upon receipt of a Company Request, the Escrow Agent
must, as soon as practicable, deliver to the Company the requested Diagnostics
Shares and any documents necessary to relinquish any rights by the Holders in
the Excess Shares and the Agent shall execute any such documents on behalf of
the Holders.

          (c) Upon receipt of an Agent Notice by the Company in which there is a
Deficit Amount, the Company must, within three (3) days of a Value Review Date,
deliver to the Escrow Agent the total number of Deficit Shares, rounded up to
the nearest whole number.

          (d) In the event that any dispute relates to a claim by the Company
that it (i) is entitled to receive a greater number of Excess Shares or (ii) is
required to deliver a lesser number of Deficit Shares than is set forth in the
Agent Notice, the Escrow Agent may release or receive any such undisputed number
of Diagnostics Shares as is specified in the relevant Agent Notice in reliance
upon such Agent Notice.

     3.   Duties and Obligations of the Escrow Agent.

          (a) The parties hereto agree that the duties and obligations of the
Escrow Agent are only such as are herein specifically provided and no other. The
Escrow Agent's duties are as a depository only and the Escrow Agent shall incur
no liability whatsoever, except as a direct result of its willful misconduct or
gross negligence in performance of its duties hereunder. The Escrow Agent shall
have no liability whatsoever for the failure of the Agent or the Company to
perform any of their respective obligations hereunder, under the Offering
Documents or otherwise.

          (b) The Escrow Agent may consult with counsel of its choice, if it so
chooses, and shall not be liable for any action taken, suffered or omitted by it
in accordance with the advice of such counsel.

          (c) The parties acknowledge that the Escrow Agent shall not be bound
in any way by the terms of any other agreement to which the Agent and the
Company are parties, whether or not it has knowledge thereof, except as may be
required in Escrow Agent's role as a party of any such document, and the Escrow
Agent shall not in any way be required to determine whether or not any other
agreement has been complied with by the Agent or the Company, or any other party
thereto. The Escrow Agent shall not be bound by any modification, amendment,
termination, cancellation, rescission or supersession of this Agreement unless
the same shall be in writing and signed jointly by the Agent and the Company,
and agreed to in writing by the Escrow Agent.

          (d) Whenever the Escrow Agent shall be uncertain as to its duties or
rights hereunder or shall receive instructions, claims or demands which, in its
opinion, are in conflict

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<PAGE>

with any of the provisions of this Agreement, it shall be entitled to refrain
from taking any action, other than to keep safely all property held in escrow,
until it shall be directed otherwise in writing by the Agent or by a final
judgment of a court of competent jurisdiction.

          (e) The Escrow Agent shall be fully protected in relying upon any
written notice, demand, certificate or document which it, in good faith,
believes to be genuine, including without limitation any Agent Notice. The
Escrow Agent shall not be responsible for the sufficiency or accuracy of the
form, execution, validity or genuineness of documents or securities now or
hereafter deposited hereunder, or of any endorsement thereon, or for any lack of
endorsement thereon, or for any description therein; nor shall the Escrow Agent
be responsible or liable in any respect on account of identity, authority or
rights of the persons executing or delivering or purporting to execute or
deliver any such document, security or endorsement.

          (f) The Escrow Agent shall not be required to institute legal
proceedings of any kind and shall not be required to defend any legal
proceedings which may be instituted against it or in respect of any funds,
securities or documents held in escrow pursuant to this Agreement.

          (g) The Escrow Agent may at any time resign and be discharged from
this escrow obligations hereby created by giving sixty (60) days prior written
notice of such resignation by mailing notice thereof to the Company and to the
Agent, and such resignation shall take effect upon the appointment of, and
acceptance of such appointment by, a successor Escrow Agent, such successor
Escrow Agent to be appointed by the Holders in the manner hereinafter provided.
The Escrow Agent may be removed after thirty (30) days' written notice by
Holders holding more than 50% of the aggregate principal amount of Notes then
outstanding by filing with the Agent and with the Company evidence of the action
in that regard taken by the Holders. If at any time the Escrow Agent (i) shall
resign or shall be removed or (ii) shall become incapable of acting, or shall be
adjudged as bankrupt or insolvent, or a receiver of the Escrow Agent or of its
property shall be appointed, or any public officer shall take charge or control
of the Escrow Agent or of this property or affairs for the purpose or
rehabilitation, conservation or liquidation, then a vacancy shall be deemed to
exist in the office of the Escrow Agent, and a successor Escrow Agent may be
appointed by Holders holding more than 50% of the aggregate principal amount of
Notes then outstanding by filing with the successor Escrow Agent, the Company
and the retiring Escrow Agent evidence of the action. If no successor Escrow
Agent shall have been appointed pursuant to the foregoing provisions of this
paragraph, and accepted appointment in accordance with this Agreement, Holders
holding more than 50% of the aggregate principal amount of Notes then
outstanding or the retiring Escrow Agent may apply to any court of competent
jurisdiction to appoint a successor Escrow Agent. Said court may thereupon after
such notice, if any, as the court may deem proper and prescribe, appoint a
successor Escrow Agent. Any resignation or removal of the Escrow Agent under
this Agreement and any appointment of a successor Escrow Agent pursuant to this
Agreement shall become effective upon acceptance of appointment by the successor
Escrow Agent. Any successor Escrow Agent appointed hereunder shall execute,
acknowledge and deliver to its predecessor Escrow Agent, and also to the Holders
and the Company an instrument accepting such appointment hereunder, and
thereupon the resignation or removal of the predecessor Escrow Agent shall
become effective and such successor Escrow Agent, without any further act, deed
or

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conveyance, shall become fully vested with all the properties, rights, powers,
trusts, duties and obligations of its predecessor hereunder, with like effect as
if originally named as Escrow Agent herein.

          (h) This Agreement shall not create any fiduciary duty on the Escrow
Agent's part to the Agent or the Company.  The Company acknowledges that the
Escrow Agent also will acts as Agent in connection with the Offering. The
Company expressly consents to the Escrow Agent's role as Agent and Attorney-in-
Fact of the Holders.

          (i) Upon the performance of this Agreement, the Escrow Agent shall be
deemed released and discharged of any further obligations hereunder.

     4.   Escrow Fees.

          There shall be no fee paid to the Escrow Agent for serving under this
Escrow Agreement. However, the Company shall reimburse the Escrow Agent for any
expenses incurred by the Escrow Agent in connection with its services under this
Escrow Agreement.  Reimbursement of such expenses shall be due immediately upon
receipt of the Company of an invoice from the Escrow Agent specifying the nature
and amount of such expenses.

     5.   Indemnification.

          (a) To the extent that the Agent and the Escrow Agent are different
parties during this Agreement, the Agent hereby indemnifies and holds free and
harmless Escrow Agent from any and all losses, damages, taxes, liabilities or
expenses (including but not limited to reasonable attorney's fees, and amounts
paid in settlement) resulting from claims asserted by the Company against Escrow
Agent with respect to the performance of any of the provisions of this
Agreement; provided that the Escrow Agent shall not be entitled to any indemnity
for any losses, damages, taxes, liabilities or expenses that directly result
from its willful misconduct or gross negligence.

          (b) The Company hereby indemnifies and holds free and harmless Escrow
Agent from any and all losses, damages, taxes, liabilities or expenses
(including but not limited to reasonable attorney's fees, and amount paid in
settlement) resulting from claims asserted by the Agent, if the Agent is a
different party than the Escrow Agent, against Escrow Agent with respect to the
performance of any of the provisions of this Agreement; provided that the Escrow
Agent shall not be entitled to any indemnity for any losses, damages, taxes,
liabilities or expenses that directly result from its willful misconduct or
gross negligence.

          (c) The Agent and the Company, jointly and severally, hereby indemnify
and hold the Escrow Agent harmless from and against any and all losses, damages,
taxes, liabilities and expenses that may be incurred by the Escrow Agent,
arising out of or in connection with its acceptance of appointment as the Escrow
Agent hereunder and/or the performance of its duties pursuant to this Agreement
by any party other than as described in Sections 5(a) and (b), including, but
not limited to, all legal costs and expenses of the Escrow Agent incurred
defending itself against any claim or liability in connection with its
performance hereunder;

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provided that the Escrow Agent shall not be entitled to any indemnity for any
losses, damages, taxes, liabilities or expenses that directly result from its
willful misconduct or gross negligence.

     6.   Miscellaneous.

          (a) All notices, requests, demands and other communications hereunder
shall be in writing, unless otherwise indicated herein, and shall be deemed to
have been duly given when (i) if delivered by hand, upon receipt, (ii) if sent
by telecopier, upon receipt of proof of sending thereof, (iii) is sent by
Express Mail, Federal Express or other express delivery service (receipt
requested), the next business day or (iv) if mailed by first-class registered or
certified mail, return receipt requested, postage prepaid, upon receipt or
refusal or failure to accept receipt, in each case if delivered to the following
addresses:

               (i)  If to the Agent or Escrow Agent, to:

                    Randall K. Davis
                    1023 Morales Street
                    San Antonio, Texas 78207
                    Tel.: (210) 227-9161
                    Fax:  (210) 224-2169

               (ii) If to the Company, to:

                    Enviro-Clean of America, Inc.
                    1023 Morales Street
                    San Antonio, Texas 78207
                    Tel.: (210) 227-9161
                    Fax:  (210) 224-2169
                    Attention: Randall K. Davis, Chief Executive Officer

or at such other address as any of the parties to this Agreement may hereafter
designate in the manner set forth above to the others.

          (b) This Agreement shall be construed and enforced in accordance with
the laws of the State of Texas. All parties hereto consent to submit any dispute
hereunder to Courts located within the State of Texas.

          (c) This Agreement may be executed in two or more counterparts, all of
which when taken together shall considered one and the same agreement and shall
become effective when counterparts have been signed by each party and delivered
to the other party, it being understood that all parties need not sign the same
counterpart.  In the event that any signature is delivered by facsimile
transmission, such signature shall create a valid and binding obligation of the
party executing (or on whose behalf such signature is executed) the same with
the same force and effect as if such facsimile signature page were an original
thereof.

                          [Signature Page to Follow]

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                   [Signature Page to the Escrow Agreement]

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
     signed the day and year first above written.

                              ENVIRO-CLEAN OF AMERICA, INC.

                              By:   /s/ Randall K. Davis
                                  -------------------------------------------
                                  Randall K. Davis, Chief Executive Officer

                              THE AGENT AND ESCROW AGENT:

                                    /s/ Randall K. Davis
                                  -------------------------------------------
                                  Randall K. Davis

                                       7<PAGE>

                                                                  Exhibit 10(ii)
                                                                  --------------

                               AGENCY AGREEMENT
                               ----------------

     This AGENCY AGREEMENT (this "Agreement"), dated as of October 31, 2001, is
by and between the Principals (as defined below), and Randall K. Davis, an
individual, as their Agent and Attorney-in-Fact ("Agent"), and Enviro-Clean of
America, Inc., a Nevada corporation (the "Company").

                                R E C I T A L S
                                - - - - - - - -

     WHEREAS, the Principals and Agent wish to enter into an agreement with
respect to the subject matter hereof;

     NOW, THEREFORE, in consideration of the above and the mutual covenants and
agreements set forth herein, and for other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged by the parties hereto,
the Principals and Agent hereby agree as follows:

                               A G R E E M E N T
                               - - - - - - - - -

     1.  Certain Acknowledgements and Understandings.  The parties hereto
         -------------------------------------------
acknowledge and agree as follows:

     (a) The Principals hereunder ("Principals") are the holders of certain
promissory notes ("Investor Notes") issued to them from time to time by the
Company.  To secure the payment of the Investor Notes, the Company has agreed to
grant a security interest in certain shares of common stock, par value $0.01, of
IVAX Diagnostics, Inc., a Delaware Corporation, under a pledge and security
agreement ("Security Agreement") for the benefit of the Principals as holders of
the Investor Notes, with Agent to act as the representative of the Principals
under such Security Agreement.

     (b) The Principals desire and agree that the Agent act as the Principals'
Agent and Attorney-in-Fact for purposes of exercising their rights and remedies
under the Security Agreement as provided in this Agency Agreement.

     (c) Agent understands the purpose of such appointment and accepts the
appointment as the Principals' Agent and Attorney-in-Fact on the terms and
conditions of this Agency Agreement.

     2.  Agency.
         ------

     (a) Subject to the terms hereof, Agent is hereby authorized to exercise the
rights of the "Secured Party" under the Security Agreement as the representative
of and on behalf of the Principals as holders of the Investor Notes, including
renewals of such notes, and to act in
<PAGE>

a reasonable and prudent manner and to take such steps as are reasonable and
appropriate in connection therewith using the same degree of care and skill that
Agent would use in the conduct of his own affairs under the same or similar
circumstances.

     (b) If an event of default occurs under the Investor Notes ("Default") and
is continuing, the Agent may declare the principal and interest of the Investor
Notes to be due and payable immediately by written notice to the Company.  In
such cases, the Agent shall have the right to pursue foreclosure on the property
securing repayment of the Investor Notes and exercise any other available
remedies.  Upon foreclosure on the property securing repayment of the Investor
Notes, proceeds realized by the Agent remaining after payment and reimbursement
of the expenses of foreclosure shall be paid to the Principals in the proportion
that the principal amount of Investor Notes held by each Principal bears to all
the outstanding Investor Notes and without preference or priority.

     (c) Prior to a Default, and after the curing or waiving of a Default which
may have occurred, the Agent shall perform such duties and only such duties as
are set forth in this Agency Agreement and the Security Agreement, and no
implied covenants or obligations shall be read into this Agency Agreement
against the Agent.  If any Default has occurred and is continuing, the Agent
shall exercise such rights and powers vested in it by this Agency Agreement and
use the same degree of care and skill in their exercise as it would exercise or
use in the conduct of its own affairs.  Notwithstanding any provision in this
Agency Agreement to the contrary, the Agent shall not be liable for any action
taken or omitted to be taken by it in good faith in accordance with the
direction of the Investor Note holders as herein provided or for exercising any
power conferred upon the Agent under this Agency Agreement.

     (d) No provision of this Agreement shall be applied to require the Agent to
advance, expend or risk its own funds or otherwise incur any financial liability
in the performance of any of its duties hereunder, or in the exercise of any of
its rights or powers, if it shall have grounds for believing that repayment of
such funds or adequate indemnity against such advance, expenditure, risk or
liability is not reasonably assured to it by either the Company or the
Principals.

     (e) The Agent may consult with legal counsel concerning its duties under
this Agreement and the written advice of such counsel shall be full and complete
authorization and protection for any action taken, suffered or omitted by the
Agent in good faith and in reliance upon such advice.  The Agent may execute any
of its powers or perform any of its duties hereunder either directly or by or
through agents or attorneys of the Agent and the Agent shall not be responsible
for any misconduct or negligence on the part of any agent or attorney appointed
by it with due care.

     (f) Although Agent is serving hereunder for no personal compensation, the
Company agrees to reimburse the Agent upon request for all reasonable expenses
and disbursements incurred or made in properly performing under this Agency
Agreement the Company also agrees to indemnify the Agent for, and to hold it
harmless against, any loss, liability, claim or expense incurred without fraud,
gross negligence or willful misconduct by the Agent, arising out of or in
connection with the acceptance or administration of this agency,

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<PAGE>

including without limitation, the costs and expenses of defending against any
such loss, liability, claim or expense. The liability of the Company concerning
the foregoing provision will survive the satisfaction and discharge of this
Agreement. If the Company shall fail to make any payment required by this
paragraph, the Agent shall have a lien therefor secondary to that of the
Investor Notes on all property or funds held or collected by the Company except
funds held in trust for the benefit of the Principals.

     (g) Prior to a Default and after the curing or waiving of all Defaults
which may have occurred, and in the absence of fraud, gross negligence or
willful misconduct on the part of the Agent, the Agent may conclusively rely, as
to the truth of the statements and the correctness of the opinions expressed
therein, upon certificates or opinions furnished to the Agent and conforming to
the requirements of this Agreement; provided, however, that in the case of
certificates or opinions required by this Agreement to be furnished to the
Agent, the Agent shall be under a duty to examine the same to determine whether
or not they conform to the requirements of this Agreement.

     (h) Whenever it is required that the Agent shall take any action upon the
happening of a specified event or upon the fulfillment of any condition or upon
the request of the Company or of the Principals, the Agent shall have full power
to give any and all notices and to do any and all acts and things incidental to
such action.

     (i) The Agent may rely and shall be protected in acting or refraining from
acting in reliance upon any resolution, certificate, opinion, notice, request,
consent, order, appraisal, report, bond, debenture or other paper or document
believed by it to be genuine and to have been signed or presented by the proper
party or parties.  Although the Agent shall not be bound to make any
investigation into facts or matters stated in any resolution, certificate,
statement, instrument, opinion, report, notice, request, direction, consent,
order, bond, debenture or other paper or document, the Agent, in its discretion,
may make such further inquiry or investigation into such facts or matters as it
may see fit, and, if the Agent shall determine to make such further inquiry or
investigation, it will be entitled to examine the books, records and premises of
the Company, personally or by agent or attorney.

     (j) Subject to other provisions of this Agreement, all monies received by
the Agent shall, until used or applied as herein provided, be held in trust for
the purposes for which they were paid, but need not be segregated from other
funds except to the extent required by law.

     (k) In the event any question or dispute arises with respect to the proper
interpretation of this Agreement or the duties of the Agent hereunder or the
rights of the Principals or the Company, the Agent shall not be required to act
and shall not be held liable for refusal to act until the interpleader for such
purpose by final judgment rendered by a court of competent jurisdiction, binding
on all parties interested in the matter, or settled by a written document in
form and substance satisfactory to the Agent and executed by the Principals and
the Company.  At the option of the Agent, it may additionally require for such
purpose, but shall not be obligated to require, an executed copy of such written
settlement by all other parties that may have an interest in the settlement.

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<PAGE>

     3.  Agent as Attorney-in-Fact.  In connection with the agreement of the
         -------------------------
Principals to appoint the Agent to act in the name place and stead of the
Principals as provided above, the Principals hereby irrevocably designate and
appoint Agent to act on behalf of the Principals as their attorney-in-fact in
exercising its authority under this Agreement and in exercising rights and
remedies of Secured Party under the Security Agreement.  Agent is hereby
irrevocably constituted and appointed as the true and lawful attorney-in-fact
with full power of attorney and authority in the name, place and stead of the
Principals to take action and to execute, acknowledge, deliver, file and record
all such documents in exercising Agent's authority as aforesaid.  The
appointment of Agent as attorney-in-fact shall be deemed to be a power coupled
with an interest and shall survive the bankruptcy, death or incompetency of any
one or more of the Principals, hereby giving such power for the transfer or
assignment of any of their interests covered hereby.

     4.  Certain Limitations on Principals.  No Principal shall have any right
         ---------------------------------
to institute any suit, action or proceeding in equity or at law with respect to
the Investor Notes or the property securing repayment of the Investor Notes,
unless (i) such Principal shall have previously given to the Agent written
notice; (ii) Principals holding more than 50% in aggregate principal amount of
Investor Notes then outstanding shall have made written request to the Agent to
institute such action, suit or proceeding in its own name as Agent, and the
Agent shall have declined to take such action or shall have failed to do so
within 30 days thereafter and no direction inconsistent with such request shall
have been given to the Agent during such 30-day period by Principals holding
more than 50% in aggregate principal amount of the outstanding Investor Notes;
and (iii) in the event that the Agent is entitled under the provisions of this
Agreement to security and indemnity against the costs, expenses and liabilities
to be incurred, such security and indemnity shall have been granted to the
Agent.  The parties to this Agreement understand and intend that no one or more
of the Principals shall have any right in any manner whatsoever by his or their
action to enforce any right hereunder except in the manner herein provided, and
that all proceedings at law or in equity shall be instituted, had and maintained
in the manner herein provided and for the ratable and equal benefit of all
holders of outstanding Investor Notes.  Notwithstanding any other provision of
this Agreement, the right of any Principal to receive payment as provided by the
Investor Notes shall not be impaired or affected without the consent of such
Principal.

     5.  Replacement of the Agent.
         ------------------------

     (a) The Agent may at any time resign and be discharged of the agency hereby
created by giving sixty (60) days prior written notice of such resignation by
mailing notice thereof to the Company and to all Principals as the names and
addresses of such Principals appear upon the registry books of the Company, and
such resignation shall take effect upon the appointment of, and acceptance of
such appointment by, a successor agent, such successor agent to be appointed by
the Principals in the manner hereinafter provided.

     (b) The Agent may be removed after thirty (30) days' written notice by
Principals holding more than 50% of the aggregate principal amount of Investor
Notes then outstanding by filing with the Agent and with the Company evidence of
the action in that regard taken by the Principals.

                                       4
<PAGE>

     (c) If at any time the Agent (i) shall resign or shall be removed or (ii)
shall become incapable of acting, or shall be adjudged as bankrupt or insolvent,
or a receiver of the Agent or of its property shall be appointed, or any public
officer shall take charge or control of the Agent or of this property or affairs
for the purpose or rehabilitation, conservation or liquidation, then a vacancy
shall be deemed to exist in the office of the Agent, and a successor Agent may
be appointed by Principals holding a majority in aggregate principal amount of
Investor Notes then outstanding by filing with the successor agent, the Company
and the retiring agent evidence of the action.

     (d) If no successor agent shall have been appointed pursuant to the
foregoing provisions of this paragraph, and accepted appointment in accordance
with this Agreement, Principals holding more than 50% of the aggregate principal
amount of Investor Notes then outstanding or the retiring agent may apply to any
court of competent jurisdiction to appoint a successor agent. Said court may
thereupon after such notice, if any, as the court may deem proper and prescribe,
appoint a successor agent.

     (e) Any resignation or removal of the Agent under this Agreement and any
appointment of a successor agent pursuant to this Agreement shall become
effective upon acceptance of appointment by the successor agent.  Any successor
agent appointed hereunder shall execute, acknowledge and deliver to its
predecessor agent, and also to the Principals and the Company an instrument
accepting such appointment hereunder, and thereupon the resignation or removal
of the predecessor agent shall become effective and such successor agent,
without any further act, deed or conveyance, shall become fully vested with all
the properties, rights, powers, trusts, duties and obligations of its
predecessor in agency hereunder, with like effect as if originally named as
agent herein; but the agent ceasing to act shall nevertheless, on the written
request of the Company or of the successor agent, or of Principals holding more
than 50% in aggregate principal amount of Investor Notes then outstanding,
execute, acknowledge and deliver such instruments and do such other things as
may be reasonably be required for more fully and certainly vesting and
confirming in such successor agent all such rights, powers, trusts, duties and
obligations of the predecessor agent and the agent ceasing to act shall also,
upon request pay over, assign and deliver to the successor agent any money or
other property which may then be in its possession as such agent may request.
Should any instrument from the Company be required by the new agent for more
fully and certainly vesting in and confirming to such new agent such properties,
rights, powers, trust, duties and obligations, any and all such instruments
shall, on request, be executed, acknowledged and delivered by the Company.

     6.  Actions by the Principals.
         -------------------------

     (a) Whenever this Agreement provides that Principals holding a specified
percentage in aggregate principal amount of the Investor Notes may take any
action (including the making of any demand or request, the giving of any
direction, notice, consent or waiver or the taking of any other action), the
fact that the holders of such specified percentage have joined therein may be
evidenced (i) by any instrument or any number of instruments of similar tenor
executed by holders of the Investor Notes in person or by agent or proxy
appointed in writing; (ii) by the record of the holders of Investor Notes voting
in favor thereof at any meeting of

                                       5
<PAGE>

holders of the Investor Notes duly called and held; or (iii) by a combination of
such instruments and any such record of such a meeting of holders of the
Investor Notes.

     (b) At any time prior to (but not after) the evidencing to the Agent of the
taking of any action by the holders of the percentage in aggregate principal
amount of the Investor Notes specified in this Agreement in connection with such
action, any holder of an Investor Note which is shown by the evidence to be
included among the Investor Notes the holders of which have consented to such
action may, by filing written notice with the Agent at its principal office and
upon proof of his status as a holder, revoke such action so far as concerns such
Investor Note.  Except as aforesaid, any such action taken by the holder of any
Investor Note shall be conclusive and binding upon such holder and upon all
future holders and owners of such Investor Note and of any Investor Note issued
in exchange therefor or in substitution thereof, irrespective of whether or not
any notation in regard thereto is made upon such Investor Note or such other
Investor Notes.  Any action taken by the holders of the percentage in aggregate
principal amount of the Investor Notes specified in this Agreement in connection
with such action, shall be conclusively binding upon the Company, the Agent and
all holders of the Investor Notes.

     (c) Prior to due presentment for registration of transfer of any Investor
Note, the Company and the Agent may treat the person in whose name any Investor
Note is registered on the books of the Company as the owner of such Investor
Note for all purposes, and neither the Company nor the Agent shall be affected
by any notice to the contrary.

     7.  Term.  This Agreement shall continue in full force and effect for the
         ----
terms of the Investor Notes and shall be terminated upon the final payment of
all principal and interest due upon the all Investor Notes and full release of
the security for the Investor Notes or upon thirty (30) days' notice by the
Principals to Agent after a vote and concurrence or written consent by the
holders of a majority of the aggregate principal amount of the Investor Notes
then outstanding.  However, the Agent shall have the right to terminate this
Agreement for any reason by giving sixty (60) days' notice to the Company and to
the Principals.  As between the Principals, this Agreement shall be deemed
coupled with an interest and may not be terminated except as expressly provided
herein.  If Agent is unable to distribute all funds it receives from the Company
to the Principals after reasonable attempts to do so for a period of one hundred
fifty (50) days, Agent shall return such undistributed funds to the Company.

     8.  Amendments.  This Agreement may be amended without the consent of the
         ----------
Principals to cure any ambiguity, defect or inconsistency or to make any change
that does not adversely affect the rights of any Principals.  All other
amendments to this Agreement shall not be made without the prior consent of
Principals holding more than 65% of the aggregate principal amount of the
Investor Notes then outstanding.  In no event, however, may amendments that
change the amount, time or form of payment called for by the Investor Notes or
make any other change that adversely affects the rights of any Principal be made
without the prior written consent of each Principal affected.

     9.  Governing Law.  This Agreement shall be construed and enforced in
         -------------
accordance with the laws of the State of Texas.

                                       6
<PAGE>

     10.  Notices.  All notices shall be in writing and shall be personally
          -------
delivered or mailed, postage prepaid, addressed as follows:

          If to the Principals:    At the address stated by the Principal in the
                                   Subscription Agreement to which this
                                   Agreement is attached.

          If to the Company:       1023 Morales Street
                                   San Antonio, Texas  78207

          If to the Agent:         Randall K. Davis
                                   1023 Morales Street
                                   San Antonio, Texas  78207

Notices shall be deemed given on the third day after the post-mark date of
mailing the notice.

          11.  Third-Party Beneficiary.  This Agreement is expressly for the
               -----------------------
benefit of the Principals and of all other beneficiaries under the Security
Agreement or other instruments securing repayment of the Investor Notes.

          12.  Binding Upon the Company.  By executing this Agreement, the
               ------------------------
Company agrees that the terms and conditions hereof shall be binding upon the
Company.

                          [Signature Page to Follow]

                                       7
<PAGE>

                   [Signature Page to the Agency Agreement]

     EXECUTED effective the date set forth above.

     PRINCIPAL:                         AGENT:

     ---------------------------        -----------------------------
     (Print Name)                       Randall K. Davis

     (Executed by Principal by signing
     of combined Signature Page under
     Subscription Agreement)

                                        ENVIRO-CLEAN OF AMERICA, INC.

                                    By:
                                        -----------------------------
                                        Randall K. Davis, President

                                       8

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