Berryman offers two different products under the Chem-Dip Carburetor & Parts Cleaner name. Part #0996 is a 1-gallon can that is completely safe on the vast majority of plastics, rubber, and paint but can be aggressive towards aluminum and aluminum alloy carburetors if soaked for long. If you use 0996, please limit your soak time to 30-minute intervals with a maximum of 2-4 hours. Part #0905 is a 5-gallon product that is very aggressive towards many types of plastic, rubber, and paint but is completely safe for extended soak times with all metals.