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I've long held it to be common sense to wash the underbody of one's car after any winter where the car may have driven over a salty road, but some of the comments on various Mustang forums have said it's not so. I've even heard it may do more harm than good, wetting the salt and pushing it up inside.

I didn't drive it in snow this winter, but I did drive it on days after where there was hefty salt chunks on the road. I live in Ohio, and it's my only car.

Does the 2012 Mustang come with a factory protective coating for the underside? Are the parts so resistant now that it just doesn't matter? I'm more concerned about functionality than appearance since not too many people will be looking underneath her. I noticed the rear axle came with rust on it, and I've read Ford doesn't protect that because surface rust doesn't hurt it.

I've taken my other cars through car washes, but I'm not going to trust a car wash with my Mustang, be it a scratchy cloth wash or a recycled water touchless wash. I wash her every few weeks (and the wheels too but less often).

If I do wash her underbody, my plan was to use a garden hose attachment which mixes soap into the water (probably try it with Meguiar's gold wash first since that's what I have) and then rinse it with a high pressure nozzle (but not a power/pressure washer since I can't afford to buy one right now). I may have to get some plastic ramps to make this work well. The Racer types seem to be better than Rhino brand though I wonder how well either works with RWD cars.

What you say you? Is washing the underbody of this car worth the time and money investment for doing so? Or will it be fine without? I'd like to know what the real deal is.
 

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There are much smarter people out there than I concerning how to properly care of a Mustang, but I bit the bullet and took my Mustang through a TOUCHLESS wash twice this winter because it was so bad. I'm not sure about anything protective, but considering the damaging nature and amount of crap they put on the roads, I felt that I had no other choice =(
 

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Put car on jack stands and wash it. The "salt" used today can actually absorb moisture from air and keep corroding metal the entire year.

I do this once a year with all my cars and use my pressure washer and soapy rag.
This is how you gets cars to avoid rust.
 
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