This long-forgotten gem of a cleaning agent may be used with a little water or vinegar to lift even the most stubborn stains. Grout. Mold and mildew stains. Burner pans. Casserole dishes. One of nature’s best bleaching agents. Use a few tablespoons with hot water or hydrogen peroxide and clean any aluminum pans, rusty drains, pans, or stains. Copper.Mix some cream of tarter with lemon juice. Rub. Rinse. Porcelain sink, tub, commode? Rub the porcelain surfaces with cream of tartar.