Patent ID: 7544649

Claim:
A method of treating a hard surface comprising treating a hard surface with an antifouling detergent composition comprising an antifouling detergent and a cationic surfactant, wherein said antifouling detergent comprises a polymer which comprises a monomer unit A derived from a compound represented by the general formula (1) and/or a compound represented by the general formula (2): wherein R 1 , R 2 , R 3 , R 7 , R 8 and R 9 each represent a hydrogen atom, a hydroxyl group or a C 1-3 alkyl group; X and Y are independently selected from the group consisting of a C 1-12 alkylene group, —COOR 12 —, —CONHR 12 —, —OCOR 12 — and R 13 —OCO—R 12 wherein R 12 and R 13 each represent a C 1-5 alkylene group; R 4 represents a C 1-3 alkyl group, a C 1-3 hydroxyalkyl group or R 1 R 2 C═C(R 3 )—X—; R 5 represents a C 1-3 alkyl group, a C 1-3 hydroxyalkyl group or a benzyl group; R 6 represents a C 1-10 alkyl group optionally substituted with a hydroxy group, a carboxyl group, a sulfonate group, a sulfate group or a benzyl group, wherein when R 6 comprises an alkyl group, a hydroxyalkyl group or a benzyl group, Z − represents an anion and when R 6 comprises a carboxyl group, a sulfonate group and a sulfate group, Z − is absent, but R 6 anions; R 10 represents a hydrogen atom, a C 1-3 alkyl group, a C 1-3 hydroxyalkyl group or R 7 R 8 C═C(R 9 )—Y—; and R 11 represents a hydrogen atom, a C 1-3 alkyl or a C 1-3 hydroxyalkyl group and a monomer unit B represented by —SO 2 —, and a monomer unit C derived from at least one monomer selected from the group consisting of acrylic acid or salts thereof, methacrylic acid or salts thereof, maleic acid or salts thereof, maleic anhydride, styrene sulfonate, 2-acrylamido-2-methylpropanesulfonate, allyl sulfonate, vinyl sulfonate, methallyl sulfonate, sulfopropyl methacrylate, and mono-ω-methacryloyloxyalkyl(C1 to 12) phosphate wherein the content of the monomer unit A in the whole monomer units is 30 to 90 mol-% wherein the molar ratio of the monomer unit B to the monomer unit A is from 0.01 to 1, the molar ratio of the monomer unit C to the monomer unit A is from 0.05 to 1 and wherein the surface comprises the ceramic surface of a toilet bowl.