Use a few tablespoons of cream of tartar with hot water or hydrogen peroxide and clean any aluminum pans which have discoloration or any rusty drains, pans, or stains. Mix some cream of tarter with lemon juice and rub the copper with it. Rinse and be amazed! How about a porcelain sink, tub, commode? Rub the porcelain surfaces with cream of tartar and watch the stains disappear. Fabric stains? No prob. Mix a few teaspoons of cream of tartar with some glycerin and use like spray-and-wash.