Patent ID: 8840731

Claim:
A method of washing dishes in a machine dishwasher, the method comprising providing to the machine dishwasher a composition comprising (a1) a copolymer obtainable by copolymerization of (a1.1) a N-vinylamide, (a1.2) vinyl acetate, (a1.3) a polyether, (a1.4) optionally a further comonomer, (a2) an ethoxylate of a linear C 16 -C 18 -alkanol having on average 8.5 to 9.5 mol of ethylene oxide per mole of linear C 16 -C 18 -alkanol; or an alkoxylate comprising at least 80% by weight of at least one ethoxylate of a linear C 16 -C 18 -alcohol of formula (I) where m is 8, 9 or 10, R 1 —(OCH 2 CHR 2 ) m R 3 (I) where: R 1 is a C 16 -C 18 linear alkyl, R 2 is C 1 -C 10 -alkyl, in each case identical or different, linear or branched, or hydrogen, and R 3 is C 1 -C 4 -alkyl, linear or branched.