Zep Concentrated Industrial Purple Degreaser is a powerful, professional-strength degreaser concentrate that penetrates and lifts heavy grease, oil, and grime fast. Built for industrial and shop cleanup, it’s ideal for heavy machinery, engine parts, garages, construction equipment, and shop floors. The low-foaming, easy-rinse formula works on unfinished concrete, metal, fiberglass, masonry, and asphalt—plus one gallon makes up to 25 gallons of ready-to-use cleaner.