HOW TO RESTORE A RUSTY CAST IRON SKILLET
What You Need
Scrubbing brush or sponge
Dish towel or paper towels
Vegetable oil (or cooking oil of choice)
Remove all the rust: Use fine steel wool to remove rust from affected areas. Scour the skillet until the area returns to raw cast iron.
Wash the skillet thoroughly: Wash the cast iron with warm water and mild dish soap. Scrub with bristle brush or mesh sponge if needed.
Dry the skillet: Thoroughly dry the cast iron immediately with a clean dish towel or paper towels.
Cover the pan with a coating of oil: Apply a small amount of vegetable oil (or cooking oil of choice) to the entire piece, including the bottom and handle. Use only a small amount to avoid a sticky surface.
Place the pan in the oven: Place the cast iron upside down on the top rack of your rack. Place a sheet of aluminum foil or a foil-lined baking sheet on the bottom rack to catch any oil drips.
Heat the pan for an hour: Heat the cast iron for one hour at 350 degrees.
Let the pan cool before using: Turn off heat, let cast iron cool, then get back to cooking!
Source and photo: Thekitchn