Scrub off loose rust and debris with steel wool or a stiff brush
Wash the skillet with warm water and a small amount of dish soap
Rinse thoroughly and dry completely
Apply a thin layer of oil to the entire skillet, inside and out
Place the skillet upside down in an oven
Bake at 450–500°F for 1 hour
Turn off the oven and let the skillet cool inside
Repeat the oiling and baking process if needed
Store the skillet in a dry place
Wipe with a light coat of oil after each use