What is rust? Rust is iron oxide, the compound that forms when iron or steel reacts with oxygen. Corrosive elements, such as salt, heat, and humidity, act as catalysts, says Tony DeArdo, a professor of mechanical engineering and materials science at the University of Pittsburgh.

How do I prevent rust? Spray steel and iron objects with an antirust lubricant (like Jig-A-Loo, available at WalMart). DeArdo suggests you also apply a layer of zinc car paint to particularly vulnerable outdoor items, such as garden tools. Store all iron and steel in a cool, dry place.

How do I get rid of it? Use a rust-removal product (sold at hardware stores). For a nontoxic cleaner, mix cream of tartar with water or hydrogen peroxide to make a thick paste; apply and rub with a cloth.

So, can I eat that burger? If you accidentally cook on a rusty surface, the food may acquire a metallic taste, but it won’t warrant a trip to the ER, says Elena Juris of the American Association of Poison Control Centers. Just remember to clean the grill before the next use.