Wash the skillet with warm water and a small amount of mild soap if needed
Scrub off any rust or residue
Dry the skillet completely
Preheat the oven to 450°F to 500°F
Apply a very thin layer of cooking oil to the entire skillet, inside and out
Wipe off all excess oil so the surface looks nearly dry
Place the skillet upside down on the oven rack
Put foil or a baking sheet on the lower rack to catch drips
Bake for 1 hour
Turn off the oven and let the skillet cool inside
Repeat the oiling and baking process 2 to 4 times
Use the skillet regularly and dry it well after each wash
Apply a light coat of oil after cleaning to maintain the seasoning