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If you have inherited an old cast iron piece or stored one that still had some moisture in it, you might encounter rust. If the rust is just beginning to appear, scrub the piece with a scouring pad, sandpaper, steel wool or a rust eraser (available at your local hardware store) and rinse well. Once the rust has been removed, make sure you dry your cookware over a heat source to remove all the moisture. Do not let your cast iron cookware air-dry, as this can promote rust. Then, reseason your cookware.

Profile rust is rust seen and felt on the cookware. To remove this type of rust, use a very fine grade of steel wool or an abrasive soap pad to scrub the affected area. When the piece is scrubbed down to the raw cast iron, it should be reseasoned immediately. If you have put any water on the cookware, you should dry it over heat before reseasoning.

Rust covering the majority of the cast iron is considered severe. You might encounter this on an older piece that has been neglected. You have two options to refurbish this cookware.

First, purchase a metal brush that will fit on a hand drill. Attach the brush to the drill and use it to scrub away the rust. Then, season the pan immediately.

Second, you can soak the cookware in vinegar and water to remove the rust. Place the cookware in a large container and surround it with hay. Fill the container with enough water to cover the pan, adding 2 cups of cider vinegar for every gallon of water. Let the pan soak for about an hour. Then, check to see if the rust has been removed. If not, scrub the pan a little and let it soak for an additional hour. Repeat until all the rust has been removed—this may take 12 to 24 hours if your pan is extremely rusty. Then, scrub it with a scouring pad and rinse and season the pan.

More extreme measures will have to be taken to rid a cast iron pot or pan of severe rust damage.