This long-forgotten gem of a cleaning agent may be used with a little water or vinegar to lift even the most stubborn stains. 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. Do you have copper kettles? 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? See link for remainder of tips!