Berryman Chem-Dip Carburetor & Parts Cleaner (part #0996) is safe on for use on plastic, rubber, and most paints and metals. However, it can react with some grades of aluminum and aluminum alloys. If you use this product and have any aluminum-based components, please limit soak times to 30-60 minutes per dip with a maximum of 4 hours total soak time.