Take new or cast iron skillet that needs restored and using hot water and mild dish soap, scrub skillet throughouly, making sure to concentrate on the rusty spots. Scrub the entire skillet, inside and out.

Rinse and remove all soap.

Place on a warm stovetop to dry the water from the skillet thoroughly, otherwise it will rust.

Once completly dry, take 1 Tbsp oil, either flax or canola. Flax is better to use but also pricy. Canola oil works fine too. Wipe oil over entire surface of skillet, inside and out.

Wipe oil off completely. To thick of a layer of oil will cause the skilled to "bake" with a sticky residue.

Once skilled is oiled, bake in oven at 500 degrees for 1 hour. You want to cook the oil past the smokig point, so oil breaks down and bonds wiht cast iron.

Turn off oven and let cool in place.