Patent ID: 7204890
Filing Date: 2007-04-17
Classification: B08B,C09D,C11D

Abstract:
1. A process for cleaning a solid surface, said process comprising the following operations: (a) forming over the solid surface to be cleaned a liquid coating of a first cleaning liquid that has both of the following properties: (b) applying to the liquid coating of the first cleaning liquid formed in operation (a) said solidification process, such that said liquid coating is converted to a solid coating; and (c) removing the solid coating that was formed in operation (b) by contacting said solid coating with a second aqueous liquid having a pH value of between 1.0 and 6.1 that dissolves, disperses, or both dissolves and disperses the solid coating during the time of said contacting; wherein in said first cleaning liquid: there is a component of dissolved solid selected from the group consisting of at least partially hydrolyzed poly(vinyl acetate), soluble nylon, poly(vinyl pyrrolidone), and gelatin hydrolyzate; and there is a concentration of at least about 0.8 ppt of a surfactant component of molecules selected from the group consisting of substances that have in each molecule: