Preheat the oven to 300 degrees.
Remove the old seasoning layer by scrubbing the cookware with a scouring pad in hot water. This will also remove any food or dirt that may be stuck to the surface.
Dry the pot or pan with the dish towel.
Coat the inside of the cookware with lard or bacon grease. Do not use vegetable oil, or the surface will be sticky.
Place the cookware in the oven for 15 minutes.
Remove the cookware from the oven, and drain off any excess grease. Be careful, as it will be very hot.
Place the cookware back in the oven, and bake for another two hours.