Betco Flatware Presoak, Characteristic Scent, 1 gal Bottle, 4/Carton (BET25990400) Case of 4Double duty product is an effective presoak for softening food soils on flatware prior to machine processing. It helps remove egg yolk, cheese, dried catsup and other sticky food residues, ensuring one wash clean ware. Flatware Presoak is also an effective detarnisher that will not harm sterling silver or other soft metal ware when used as directed.