Simple Green Pro HD Heavy-Duty Cleaner is a ready-to-use, professional grade cleaner and degreaser that breaks down tough grease, eliminates grime and removes stains on a wide variety of surfaces including engines, car exteriors, appliances, machinery floors, walls and more. It is non-corrosive to metals, non-degrading to plastics and clean rinsing. The biodegradable liquid biodegrades 94% within 28 days after disposal into a typical sanitary sewer of septic system, providing a safer alternative to solvents and other harsh cleaning chemicals without sacrificing performance.