Powerful solvent, d-Limonene, which is made from natural orange peel extracts. All natural, biodegradable formula uses no petroleum distillates. Effectively strips away grease, grime, oils, tar and more. Safe Solv 378 (95% d’Limonene) will clean trucks, compressors, heat exchangers, hydraulic units, machine shop equipment, turbines, engine blocks as well as metal decks, floors, conveyors, dumpsters, brick, concrete, etc. It can be used in its super-concentrated form or in a variety of dilutions to clean virtually any types of materials.