Patent ID: 7501387

Claim:
A method of antifouling and washing hard surfaces of toilet bowls, comprising: treating the surfaces with an antifouling detergent composition comprising a polymer having a weight-average molecular weight of 5,000 to 60,000 and consisting essentially of monomer unit A and monomer unit B, wherein the molar ratio of monomer unit A/[monomer unit A+ monomer unit B] is ⅔ to 0.9 wherein the monomer unit A is di (ω-alkenyl (C 2 -C 10 )-dialkyl (C 1 -C 3 ) ammonium salt in an amount of 10 to 90 mol-% relative to the whole monomer units, the monomer B is at least one monomer derived from a monomer selected from acrylic acid or salts thereof, methacrylic acid or salts thereof, and maleic acid or salts thereof.