Hard anodized cookware should be washed after each use with hot water and dish detergent. A rag, sponge or nylon scrub pad should be used to scrub away any food residue. Rinse well using warm water and dry it with a clean towel. For tougher stains, use baking soda and water paste. Scrub the paste into the cookware with a nylon scrub pad and let it stand for 30 minutes. Then wash the paste off and dry it thoroughly. Usually, you can also use bleach products and hard anodized cleaner to wash off any stains or stubborn food residue. Before you use any bleach products, make sure to read the manufacturer's manual to see if your cookware is compatible with these products.