Patent ID: 7591272

Claim:
A method of removing limescale and soap scum from a surface comprising: (i) applying a cleaning composition to a surface chosen from a shower, a bath tub, and a sink, and (ii) rinsing the cleaning composition from the surface, thereby cleaning limescale and soap scum from the surface, wherein the cleaning composition is an acidic composition and comprises: (a) a hydrophilizing polymer comprising a water soluble or water dispersible copolymer comprising a reaction product of: (I) at least one monomer having the following structure (I): wherein R 1 and R 4 independently represent a hydrogen atom or a linear or branched C 1 -C 6 alkyl group; R 2 and R 3 independently represent an alkyl, hydroxyalkyl or amino alkyl group in which the alkyl group is a linear or branched C 1 -C 6 chain; n and m independently represent integers between 1 and 3; X − represents a counterion; and (II) at least one hydrophilic monomer having an acidic function which is copolymerizable with (a) and capable of ionizing in the medium of use; and wherein the molar ratio of monomers (a)/(b) is from about 60/40 to about 5/95, (b) a surfactant, (c) an acid, and (d) a solvent comprising propylene glycol N-butyl ether.