GUNK Shine is an Engine Detailer and Protector with a pleasant citrus scent that leaves your engine with a protective layer that makes future clean-up easier. When used as directed it will also leave behind an attractive detailer?s satin-like finish on underhood surfaces such as hoses, plastic, and metal parts. Contains no silicones that can create a greasy, dust-collecting buildup. Use it on cars, trucks, tractors, boats, RV?s, ATV?s, compressors, generators, bicycles, and motorcycles. Safe on most underhood rubber, plastic, and paint when used as directed.