Spray Nine Grez-Off’s ready-to-use, biodegradable water-based formula quickly degreases heavy duty automotive soils. Bolstered with fast-acting surfactants, Grez-Off penetrates grime and lifts it away like no other product can. Ideal for removing heavy grease, dirt, fifth wheel grease, lubricants, oil, hydraulic fluid, grime, heavy moly grease and tar. No harsh fumes or unpleasant odors. VOC compliant in all 50 US states. Readily biodegradable according to OECD 301-C Modified MITI Test (I). Non-combustible and non-flammable. No abrasives. Ready-to-use (no mixing required).