Follow these simple steps to restore your iron skillet:
1. Remove all the rust (duh)
Use fine steel wool to remove the rust. Don’t stop until the skillet returns to raw cast iron.
2. Wash the skillet
Wash the cast iron with warm water and dish soap. Scrub with bristle brush, or mesh sponge.
3. Dry the skillet
Dry the cast iron with a clean towel or paper towels.
4. Cover the pan with a coating of oil
Apply a small amount of cooking oil of your choice to the entire pan, handle included.
5. Bake in the oven at 350°F
Place the cast iron on the top rack of your oven, upside down. Place a sheet of aluminum foil, a pan, or baking sheet on the bottom rack to catch any oil. Bake the pan for one hour.
6. Let the pan cool off
Let cast iron cool before taking it for a spin.
And that is all! You are ready to use your brand new cast iron skillet!