how to clean exhaust fume residue from my paint? - Mercedes-Benz Forum
 
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#1 (permalink) Old 11-10-2011, 04:21 AM
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how to clean exhaust fume residue from my paint?

I recently painted my car and since then I have been using it much more (I work from home). But I'm beginning to notice grease and residue (from diesel fumes) sort sticking to the paint near exhaust.

Even after I gave it a good wash the residue is still there. My only conclusion is that it has to be exhaust fumes. The grease/residue is only on that side in the rear of the car.

Specifically near the 300D badge and around the license plate a little less. What is the best way to get rid of this? Simple de-greaser during a wash?

Is there any way to prevent this?
Is this normal?

El Pookie aka Mr. Jackie
1982 300D Turbo Diesel
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#2 (permalink) Old 11-10-2011, 11:02 AM
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You did wax the car after it got painted right? The only reason I can see that the diesel residue would "stick" is if the paint were bare and exposed to the elements. Otherwise yes, it's not all that unusual. My 240 had it when I first got it and it looked like a real mess back there. What I did was the usual wash with car soap, warm water and a good high quality mitt. I dried it, then followed with clay bar, cleaner wax, and 2 good coats of carnauba for final protection. You can also use a light polish (low abrasive content) but I find that the cleaner wax does just as good a job and is easier to work with especially when going around tight spaces like the tail light trims or the trunk lock. Polish is a pain when working by hand in those areas. My left rear tail light seemed to have some soot/residue on the inside so I cleaned that out as well.

Do not use degreaser. It strips the paint of its coat of wax and will actually oxidize the finish if left on there for too long. I've had that happen while using the stuff to wash the engine.

1982 240D - selling once a replacement is found
1985 380SE - laid up
Looking for a 300SD or 300TD

Last edited by 240_benz; 11-10-2011 at 11:04 AM.
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#3 (permalink) Old 11-10-2011, 01:42 PM
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wow... nice reply. I'll give it a try. I applied some Meguires but next time I'm going to apply a heavy coat of wax/sealer after a thorough wash in the rear section where it clings to the most. I was able to remove most of the "residue" with compound.

This weekend I'm going to do what you said.

El Pookie aka Mr. Jackie
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#4 (permalink) Old 11-10-2011, 01:59 PM
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+1 on sealer.

1982 240D - selling once a replacement is found
1985 380SE - laid up
Looking for a 300SD or 300TD
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#5 (permalink) Old 11-10-2011, 09:41 PM
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You did not have to use rubbing compound. Rubbing compound is too aggressive.

I've used Paint Cleaner (Meguiar's bottle still has some after a few years, just don't forget to shake) and this usually gets the job done.

If you want to do a really thorough job you can remove the rear bumper (typically the rear apron is what turns dark from soot) and clean it thoroughly w/ the method you choose.


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#6 (permalink) Old 11-11-2011, 05:23 AM
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I agree w/ 240, your going to have to keep after it w a good cleaner wax after everytime you wash her. Another area to keep an eye on is around the fuel door, if you ever spill on fill up.

The wax will make the clean up next time easier.

In the spring, clay bar the entire car for an even better shine. Your MB will never have looked so fine!

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