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My WHITE 06 ML350 has been taking a beating with the winter weather this year. After a wet snowy trip through the iron mining areas last winter, a car wash revealed that many tiny flecks of metal from the road must have stuck to the finish and then rusted and discoloring the clear coat - many tiny rust colored spots on my white paint. I was able to remove them mostly. However this winter I am finding this to be an even larger issue without driving out of my area. It seems impossible to keep the car dry let alone do a wash because of the weather. Any idea on what really is causing this, how to avoid or prevent, and how best to remove the small spots once it warms up?
 

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Its caused by industrial fall out.
What you can do is use a clay bar to get rid of the spots and then use a good sealant afterwards. I find that Collinite Insulator Wax works really well against the problem and last a long time, but thats just my opinion. Bottom line is you need some good protection on that paint.
 

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Brake dust from metallic pads cause this too as well as rail dust from the transport train.
 
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