Over time, air and water can cause even the toughest cast iron pan, bakeware or "stainless" steel teakettle to rust. Failure to treat rust stains can make the cookware useless and lead to total disintegration in rusty spots. The good news is that treating rust on your kitchen items is easy and can be done naturally. Sprinkle salt all over the rust (be generous) and squeeze half a lime on the salt so the rust is saturated. Wait 15 minutes and rub the salt into the rust stain, then wipe away with the used lime half. Repeat if necessary. For tougher rust stains, soak the item in white vinegar and scour it away with crumpled aluminum foil. Keep repeating until the rust is gone.