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NULON Radiator Flush & Clean (R40).

• R40is a fast-acting, 20 minute cleaner that requires no premixing.


• R40 reduces harmful sludge and scale from radiators and heater cores and cleans the entire cooling system safely.


• Used in stock and high performance engines.


• Caution when removing radiator cap if engine is hot.


• Directions for use on bottle.