Patent ID: 7056876

Claim:
A water-containing, thixotropic, cleaning paste comprising: a. about 5 to about 40 wt. % of a source of alkalinity, wherein the source of alkalinity is selected from the group consisting of an alkali metal hydroxide and an alkali metal carbonate; b. at least about 15 wt. % of water; and c. at least about 3 wt. % of a nonionic surfactant, wherein the nonionic surfactant has the general formula R 1 —(OC 2 H 4 ) n —OH where R 1 is a C 10 –C 20 branched or unbranched alkyl or alkenyl group n is the average degree of ethoxylation and has a value from 5 to 20; wherein the composition has a viscosity at 25° C. from 50,000 mPas to 250,000 mPas as measured with a Brookfield rotational viscosimeter having a spindle number 7 at 5 r.p.m.