REPLY: Many distributors say not to use chlorine bleach nor cationic sufactants (fabric relaxers, fabric conditioners).  

AIUI too high a concentration of bleach may distort the fibers [please confirm].  The cationic surfactant will fill the holes in the microfiber and reduce its efficiency.

Similarly microfiber should not be washed at too high temperatures (eg 80 celsius).  However it is hard to get microfiber to release the dirt it holds and so the method of washing needs to be a bit of a compromise.

Do not wash with other garments especially those which shed small particles of fiber as these will be taken in and held by the microfiber cloth.

There does not seem to be a case for using special detergents.

Again, some will advocate using a drier but the temperature must not be so high as to distort the micro fibers.  I would not want to iron or press washed microfiber because of the possible loss of the dirt traps.

Some distributors will suggest the use of bleach (eg 3M and its Scotch-Brite microfiber kitchen cloths) and others will specify rather high temperatures.  Perhaps their microfibers have been treated or manufactured to withstand such washing but I am not sure how it could have been achieved.

http://www.microfiber-products-online.com/faqs.html