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Penetrates and dissolves heavy dirt and deposits. STP Professional Heavy Duty Engine Degreaser is designed to penetrate and dissolve heavy grease and grime to give your engine a professional clean up. STP Heavy Duty Engine Degreaser is suitable for car, lorry, van and tractor engines. Directions for Use: 1. Shake can thoroughly before use. Spray liberally on the designated area. 2. Allow STP Heavy Duty Engine Degreaser to remain in contact with the surface for a few minutes to penetrate and solubilise contaminants, and rinse off with plenty of water. Brushing or other forms of agitation will assist in effective solubilisation of stubborn deposits. 3. Always dispose of contaminated materials in a sealable metal bin to prevent fire risk. Take Note: Avoid spraying or dripping on exterior body paint, soft plastics, asphalt driveways or other surfaces affected by petroleum solvents.