Summarize this article in one sentence.
Use a damp cloth to clean out the inside of your skillet until the water runs completely clear. Give the surface of the cast iron a light wash to remove any remaining rust or particles left by the steel wool. Turn your oven onto the highest heat that it can go and place a piece of tin foil on the lowest rack. Put your cast iron skillet upside down on the highest rack and leave it to cook for around 1 hour. This will help seal in the oil and season your skillet. The tin foil will catch any excess oil that comes off the skillet as it cooks. It's much easier to throw away a piece of foil than it is cleaning your oven! After an hour, turn your oven off and let the cast iron skillet cool down. It should be cleaned, seasoned and ready to use. However, for the best results, you should oil and bake your skillet once or twice more. This will build up the coating of oil even further and make your cast iron last even longer. Store your skillet in a clean and dry place. Cast iron tends to rust very quickly, so make sure to keep it away from as much moisture as you can.

Summary:
Clean the skillet with soap and hot water. Put the skillet in your oven at around 500 °F (260 °C) for 1 hour. Let the pan cool and repeat the seasoning process.