Wash the skillet with hot water and a small amount of mild soap if needed
Scrub off any rust, old food, or flaky seasoning
Dry the skillet completely
Apply a very thin layer of cooking oil to the entire skillet, inside and out
Wipe off all excess oil until the surface looks nearly dry
Place the skillet upside down in an oven
Put foil or a baking sheet on the lower rack to catch drips
Heat the oven to 450–500°F
Bake for 1 hour
Turn off the oven and let the skillet cool inside
Repeat the oiling and baking process 2–3 times for a stronger seasoning
Use the skillet regularly and apply a light oil coat after cleaning