Pre-heat the griddle to 300-350 degrees Fahrenheit. Pour Griddle Kleen over your grill plate, immediately spreading and scrubbing the liquid across the griddle's top. Scrape any remnants into the unit's grease trap, turn off the griddle, and allow it to cool. Rinse or wipe the surface with a damp cloth, and you're ready to cook! Applying a thin coating of liquid shortening after cleaning helps prevent rusting.