If you have a cast iron griddle, clean it just like you would clean a cast iron skillet. The only items you will need are a flat-edged metal spatula, some paper towels, and some water—plus a drop of dish soap if your griddle is really, really dirty. Make sure to clean your griddle while it is still hot. Don’t let grease and food particles cool and bake onto the metal surface. The heat will actually make the cleaning process easier, if you don’t wait. Step 1: While the griddle is hot, use a flat metal spatula to scrap off excess debris.