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Old 11-27-2017, 12:08 PM   #1
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Cleaning underside - What degreaser works best?

I was under my 2005 MH this weekend. Changed oil. I noticed it's pretty dirty/greasy under there. What one would expect under a 12 year old "heavy truck" chassis.

I would like to clean things up - and do a good inspection. I have a couple of small air leaks to find too.

I have a pressure washer (which I would use on "low pressure" in a "fan like" pattern).

What degreaser should I spray/use? Something like a spray-on engine degreaser or simple green or ?
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Old 11-27-2017, 12:11 PM   #2
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Itís expensive, but nothing beats brake cleaner.
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Old 11-27-2017, 01:25 PM   #3
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I have Brake Cleaner but i don't think that is the best product for this job. I need something to cover a lot and sit and soak for a while. Brake Clean evaporates too fast.
Maybe Simple Green concentrated mixed with water in a pump-up sprayer - or that Engine Degreaser "foam" in a can.
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Old 11-27-2017, 04:23 PM   #4
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I would be careful on your selection. A lot of heavy cleaners will dissolve your undercoating
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Old 11-27-2017, 05:41 PM   #5
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Hi Mike; For years I have been using Castrol Super Cleaner in the 1 gallon jug that I bought at Shucks auto supply quite a while ago. Ha d a terrific sale with no limit so I bought 10 gallons. The stuff works great, but here are some things that I have found out using it. If the grease of grime is not thick, it will remove down to the paint, or undercoat and look brand new. I use it on my wife' car wheel wells and to clean up the underside of my Jeep Wrangler. Do not spray the cleaner on hot painted surfaces as it could fade or leave streaks. Also I have found this procedure works best. On a cool surface, spray with water, then spray on cleaner. If you want to use a brush you can but most times I don't. Do not let the cleaner air dry. Wait about 5 min. or less then rinse with a good pressure garden hose or a pressure washer. Not too much effort. Again, do not let the cleaner dry on the surface that you are cleaning as it will leave some streaks. I would not use it on alum. wheels or painted surfaces, like the side of the coach paint. Works for me.
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