If cast iron is rusty, use steel pads to remove rust and wash in hot Dawn detergent really well. Dry cast iron. I use cooking oil to season the cast iron; using paper towel, rub oil generously onto cast iron, inside and outside. Place a heavy duty piece of foil on the shelf of the oven and turn thermostat to 350 degrees F. Place cast iron top side down and season for 1 hour. This will allow the excess oil to drain off the cast iron. Allow to cool and wash with warm water. No soap.
My first item cooked in my iron skillets, is a pan of cornbread. I place 2 tablespoons of oil into the skillet and heat to slightly smoking and pour the mix into the skillet and bake at 400 degrees F. It slides right out. No sticking.
By Marie G W. from VA
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I put them in a plastic garbage bag, soaked a towel with ammonia, and left it tied in bag for several days (maybe 4 days.) As I took each one out to wash and clean, I left the others in the bag. They clean well with a little elbow "grease". They looked almost new.