Unplug the power cord and make sure the heater is cool before continuing. Clean the outer shell with a soft, damp cloth. You may use a mild detergent if necessary. After cleaning, dry the unit with a soft cloth. DO NOT use alcohol, gasoline, abrasive powders, furniture polish or rough brushes to clean the heater. In case someone accidentally touches the heating filament, use rubbing alchohol to wipe the filament and make sure that the alcohol is fully evaporated before turning on. DO NOT immerse the heater in water. Wait until the heater is completely dry before use.