Mothers 87538-4 Professional Water-Based Degreaser - 1 Gallon, (Pack of 4) Mothers Water-Based Degreaser features a safe but effective blend of grease cutting surfactants and biodegradable solvents which lift away carbon and baked-on grime from a variety of surfaces This non-toxic, super-concentrate is tough on tenacious filth, but will not stain paint or harm aluminum engine components Recommended Dilutions: Light to Moderate Degreasing - 1:4, General Purpose - 1:2, Heavy/Engine Degreasing - 1:1