PBW (Powdered Brewery Wash) is a non-caustic cleaner for stainless steel, glass, copper, and even plastic that is widely used in commercial breweries. Use 1 - 2 oz (1.5 - 3 Tbsp) per gallon of water. Soak 20-30 minutes, then rinse well with warm water. Soaking longer, even overnight, will help remove all those organic deposits of fermentation with little scrubbing. After rinsing the next morning, they will be shiny and clean. It can effectively clean items that can't be reached with a brush or sponge. PBW is environmentally friendly and will not harm "friendly" bacteria in septic systems.