Never use steel wool on nonstick, enameled, copper, or aluminum cookware as it will scratch the surface. Steel wool can be used with great caution on stainless steel and cast iron cookware, as they are more durable. If you have a burnt-on mess on your cookware, try other gentle cleaning methods first, such as using vinegar and baking soda, lemon and salt, or cream of tartar. If those methods don't work, and your cookware is suitable for steel wool, use it gently to avoid leaving permanent scratches.