Gunk Engine Cleaner and Degreaser is designed to safely clean and degrease every surface of your engine. Just like Gunk's Original Engine Degreaser, this formula is built to tackle the toughest dirt, grease and oil the road can throw at it and is readily biodegradable. This Zero-VOC formula is safe on all metals and plastics under the hood. A clean engine will run cooler, last longer and hold its value better over its lifetime. Always make sure to Clean your engine and then Protect it with Gunk's Engine Protector - Shine product.