CRC 05081 Clean-R-Carb Carburetor Cleaner - 16 Wt Oz Quickly dissolves carburetor deposits such as gum, sludge and varnish to improve fuel system performance A carb & choke cleaner that is designed to maximize carburetor performance Enhances fuel economy Instantly dissolves deposits on venturi, linkages, butterflies and PCV systems Harmless to catalytic converters and oxygen sensors