Klotz Plug and Contact Cleaner will safely and quickly clean and degrease all metal and aluminum surfaces, fouled spark plugs, carburetors and other small parts. Non-conductor formula for 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. Will not damage engine parts, carburetors, brake parts, ignition parts, spark plugs or engine sensors.