Patent ID: 7530360

Claim:
A method comprising operating a machine dishwasher with a rinse aid contained therein which comprises, as a depositing-inhibiting additive, a copolymer comprising alkylene oxide units and comprising, in randomly or blockwise copolymerized form, (a) 50 to 93 mol % of acrylic acid and/or a water-soluble salt of acrylic acid, (b) 5 to 30 mol % of methacrylic acid and/or a water-soluble salt of methacrylic acid and (c) 2 to 20 mol % of at least one nonionic monomer of the formula I in which the variables have the following meanings: R 1 is hydrogen or methyl; R 2 is a chemical bond or unbranched or branched C 1 -C 6 -alkylene; R 3 is identical or different unbranched or branched C 2 -C 4 -alkylene radicals; R 4 is unbranched or branched C 1 -C 6 -alkyl; n is 3 to 50, wherein the copolymer has a weight average molecular weight of from 3,000 to 30,000.