PBW (Powdered Brewery Wash) is a patented alkali cleaner originally developed for Coors, now widely used in commercial breweries across North America. Use 1 to 2 ounces per gallon for cleaning kettles, 3/4 ounce per gallon for fermenters, kegs, tanks, and other equipment. Soak equipment overnight in PBW solution; rinse the following morning - no scrubbing required! Will not damage rubber gaskets, soft metals, or your skin. PBW can effectively clean items that can't be reached with a brush or sponge, and is strong enough to remove thick, difficult, caked-on organic soils. PBW is environmentally friendly, biodegradable, and will not harm septic systems.