To keep my cast iron skillets and pots seasoned, I wash them in hot soapy water after use and then dry them on the stove. As soon as they dry, I spray vegetable oil from my spray pump onto the surface of the pot or skillet, wipe the excess off with a dishrag or paper towel and then take them off of the heat. The hot iron absorbs the oil and keeps the pots from sticking.
I have seen some people burn theirs off in a fire. Others say spaying the pan with easy off and placing in a black bag for a while takes off the gunk. to where you can re-season it.
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