Use a steel wool to clean any rust off the cast iron skillet. The rust should flake away and reveal the cast iron below.
Wash the cast iron with warm water. Use a soft sponge if needed.
Dry the skillet off with a lint free towel.
After the skillet is completely dry, pour 2 Tablespoons vegetable oil in pan. If you don’t have vegetable oil, you can use canola oil or a high quality olive oil or avocado oil.
Then take a paper towel and rub the cooking oil all over bottom and sides of pan making sure the entire pan has a thin layer of oil. Use your paper towel to remove any excess oil.
Place the pan upside down into an oven preheated to 350 degrees Fahrenheit for an hour. Place a pan covered in foil under the pan to catch any oil that might fall off the pan.
Lastly, turn off the oven and allow the pan cool to room temperature in oven.
Then the cast iron is ready to use as normal. Enjoy!