Reducing agent as corrosion inhibitor for machine warewash

A method of cleaning using a detergent composition that reduces the rate of corrosion in a ware washing machine, comprising:

• applying to ware in the ware washing machine a use solution of the detergent composition free of enzymes and bleaching agents using water from a prior sanitizing rinse step containing at least 30 ppm of chlorine, the detergent composition comprising:
• a reducing agent that is a salt containing ammonium cation;
• about 30 wt-% to about 70 wt-% of an alkalinity source in a liquid detergent composition or about 40 wt-% to about 90 wt-% of an alkalinity source in a solid detergent composition, and;
• at least one additional functional ingredient comprising at least one builder, at least one water conditioning polymer, and/or at least one surfactant;
• reducing residual chlorine in the ware washing cycle during the detergent step to less than 20 ppm within 60 seconds and thereby reducing the rate of corrosion in the ware washing machine by at least about 50%;
• and thereafter;
• applying a sanitizing composition to ware in the ware washing machine during the sanitizing step of the ware washing cycle, wherein the sanitizing composition comprises chlorine.