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Message: <blockquote data-quote="Randy" data-source="post: 173622" data-attributes="member: 820">This is from a website Tools you will need: water hose capable of reaching around the car non-silicone wash sponge gentle non-metal ferrule brush 2 oz. natural solvent 'soap' small air compressor 2 clean Microwipes eye protection The most important thing to be aware of when preparing to wash your car's undercarriage is the temperature of the area being washed. This is even more important than the ambient temperature, which should be between 50o and 80o F. In addition, on recently driven cars, the engine, exhaust and suspension and components will be very hot, and if cold water gets onto these hot surfaces it will cause temperature shock damage. So let your undercarriage cool to the touch. VERY IMPORTANT: Remove your watch, rings, keys and bracelets. Be alert to belt buckles, zippers and rivets on jeans. One slip can be a costly scratch or dent. Start the washing process by mixing the natural solvent soap with distilled water to produce a sprayable wash. Cover tailpipes, rotors and calipers with small plastic bags and a heavy elastic bands. Using 25-30 psi blow out loose dirt, sand and silt from the entire undercarriage. [eye protection needed here] Do not blow air into your tailpipes. The high air pressure can damage your mufflers and or catalytic converter(s). Spray your undercarriage completely with the natural solvent soap mixture being sure cover all exposed areas. Let the soap do its work. Allow at least 15 minutes of dwell time on all surfaces to effectively loosen dirt, undercoating and Cosmoline. Using your soft brush, agitate the soap on known heavily soiled areas. Spray your soap again and let sit for another 10 minutes. Rinse gently and review your work. Try to remember undercoating and Cosmoline originally sprayed on your car by the factory has had many hours to bake and harden. If your first effort to remove the offensive material is less productive than hoped, simply try again. Caution: Aggressive scrubbing causes damage. Take your time and be gentle. Now rinse your entire undercarriage. Using your air hose, gently blow out all areas that you believe trap water. [eye protection needed here] Next, gently dry your undercarriage using 100% un-sized cotton towels or non-polyester Microwipes being sure to wipe the bonnet and any collected water in body drainage areas, door jams and sills. </blockquote>

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