Scrub the rusted areas with steel wool or a stiff brush
Wash the pan with warm water and a small amount of dish soap
Rinse and dry the pan completely
Apply a thin layer of vegetable oil or flaxseed oil
Bake the pan upside down in the oven at 450–500°F for 1 hour
Let the pan cool in the oven
Repeat seasoning if needed
Store the pan in a dry place
Avoid soaking the pan in water
Wipe the pan dry after each use