Klotz® Plug & Contact Cleaner® will safely and quickly clean and degrease all metal and aluminum surfaces, fouled spark plugs, carburetors, and other small parts. Nonconductor formula is safe to use on electrical systems, electric switches, connections, motors, starters, and alternators. Completely cuts through and removes carbon, oil, dirt, grease, tar, and adhesives without leaving a residue. Safe for use on engine parts, carburetors, brake parts, ignition parts, spark plugs, and engine sensors.