CRC 05379 Clean-R-Carb Carburetor Cleaner (50 State Formula) - 12 Wt Oz Instantly dissolves deposits on venturi, linkages, butterflies and PCV systems to improve fuel system performance and enhance fuel economy. Harmless to catalytic converters and oxygen sensors. 50-State Formula. Meets ALL state and federal VOC regulations. A carb & choke cleaner designed to maximize carburetor performance.