Gunk Engine Degreaser Heavy Duty Gel, Our Best Engine Degreaser, is specially formulated to remove baked on grease and oil from hotter-running engines. Gunk Heavy Duty Gel clings to the engine surface being sprayed and does not run off. Since the product stays where it’s sprayed, it has more time to penetrate baked on engine soils. Heavy duty degreasing formula for Cars, Trucks, Power Mowers, Marine, Heavy-Duty Rigs, Farm Equipment and Tractors as well as Industrial Machinery. Clean your Engine with Gunk Heavy Duty Gel and then protect it with Gunk Shine.