Scrub off loose rust with steel wool or a stiff scrub brush
Wash the skillet with hot water and mild dish soap
Rinse thoroughly and dry completely
Apply a paste of baking soda and water to stubborn rust spots
Scrub again until the rust is removed
Rinse and dry immediately
Coat the skillet lightly with cooking oil
Bake it upside down in the oven at 450°F for 1 hour
Let it cool in the oven
Wipe off any excess oil before storing
Repeat seasoning if needed