I let everyone in the family know when I'm going to "clean up the skillets". I'll set up the fish fryer and set a skillet on it till its way hot. Hit it with a wire brush and get all the ash off and set it to the side and work on the next one. After the skillets cool to the point where you can just rub some shortening in them with a paper towel I rub the shortening inside and out and let them sit some more. You wind up with clean seasoned cast iron.