Clean a Cast-Iron Pan
5. Most cooks know that you should never use liquid soap on a cast-iron pan and never scrub it with anything abrasive if you want to maintain its well-oiled nonstick surface. So how do you clean it? Use salt. If the pan will not rinse clean with water and a soft dishcloth, rub it with a few tablespoons of salt and a paper towel, and rinse. Then replenish the oil film by coating the inside surface with a dab of cooking oil.