After cooking, your cast iron griddle must be properly cleaned. Contrary to popular belief, it is safe to clean griddle on the stove. Once the cast iron griddle has cooled slightly, sprinkle some coarse salt on the surface and wipe away any food residue with paper towels. The salt acts as a mild abrasive to remove bits stuck to the cast iron griddle without damaging the skillet's seasoning. After the cast iron griddle is clean, wipe it with a damp cloth and dry it thoroughly.