Anti-foam system for automatic dishwashing compositions

A method of washing tableware in an automatic dishwashing machine comprising:

• contacting soiled tableware with a detergent composition comprising
• a) an anti-foam system comprising (i) 0.01 to 1.0 wt. % of the total dishwashing composition of a fatty acid and salts thereof having from 16 to 18 carbon atoms, and (ii) 0.1 to 2% by wt. of the total dishwashing composition of a carrier containing a ketone having at least 25 carbon atoms, the ratio of ketone/carrier to fatty acid being from 5:1 to 1:1,
• b) 0.5 to 40 wt. % of a surfactant selected from the group consisting of
• (i) an anionic surfactant with a hydrophilic head group which is, or which contains a sulfate or sulfonate group and a hydrophobic portion which is or which contains an alkyl or alkenyl group of 6 to 24 carbon atoms,
• (ii) an alkyl glycosides,
• (iii) an ethoxylated fatty alcohol of formula
• RO(CH.sub.2 CH.sub.2 O).sub.n M
• wherein R is an alkyl group of 6 to 16 carbon atoms and n has an average value which is at least four such that the HLB of the ethoxylated fatty alcohol is 10.5 or greater,
• and mixtures thereof,
• c) 0.1 to 10 wt. % of a proteolytic enzyme,
• d) 1 to 30 wt. % of a bleaching agent selected from a group of a peroxygen agent, a hypohalite agent and its corresponding salts and its mixtures thereof, and
• e) 1 to 75 wt. % of a builder,
• to substantially clean the tableware and to substantially inhibit foam formation.