Patent ID: 7985723

Claim:
An aqueous cleaning solution comprising: (a) an acid; and (b) a surfactant of the formula: wherein: R f is a C 2 to C 6 perfluoroalkyl group; R is a C 2 to C 25 alkyl, hydroxyalkyl, an alkylamine oxide or an aminoalkyl group which is optionally interrupted by a catenary oxygen, nitrogen, or sulfur atom; R 1 is an alkylene group of the formula —C n H 2n (CHOH) o C m H 2m —, wherein n and m are independently 1 to 6, and o is 0 or 1, and where the alkylene is optionally interrupted by a catenary oxygen, nitrogen or sulfur atom; and M + is a cation; and further comprising ammonium hydroxide.