Gunk Engine Brite GEL HD Engine Degreaser removes grease and grime from auto, power mower, marine and tractor engines, metals, concrete and tires, industrial equipment where water is permitted. The GEL engine Degreaser contains special rheological additives that allow the product to cling to vertical surfaces, allowing the solvents to loosen difficult soils and absorb greases and oils to be carried away during the rinsing phase. Also meets all state VOC requirements with a VOC Content under 35 percent.