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Old 11-11-2016, 03:48 PM   #1
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Anyone else get 'diesel dots'?

In the last few years I've noticed that I get little tiny oily dots on my motorhome, primarily on the driver's side and mostly towards the rear. Sometimes there are more than a hundred dots when I return from a trip. With a little time, they get hard and pluck off with a finger nail. The more recently I've polished the motorhome, the easier they come off. But it takes a lot of time to clean them up.

I've been driving motorhomes for more than 15 years and have only recently noticed this. I'm thinking it's from the vertical exhaust of diesel trucks that are usually passing me (speed limited by toad) hence the driver's side getting the worst of this.

Anyone else? Ideas on where it comes from? Cleanup? -thanks
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Old 11-11-2016, 04:57 PM   #2
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Spots...

Are they similar to this?

AutoEducation.com Car Blog |Little Black or Brown Spots on Car - AutoEducation.com Car Blog
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Old 11-12-2016, 06:50 AM   #3
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If it is artillery fungus it is a pain in the butt to clean off. It usually lives in mulch that hasn't been replaced for a while. We had it on our siding of her house. Pressure washer with the nozzle 2 inches away from it doesn't get it off.
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Old 11-12-2016, 07:12 AM   #4
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Sounds like fly poop to me.....
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Old 11-12-2016, 08:26 AM   #5
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This thread is ripe for constuctive comments. :-) I like the mulch one so far. But, if the OP only has them on the front of his unit, then diesel dots gets my vote. Unless, the mulch spores are target specific......
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Old 11-12-2016, 09:31 AM   #6
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This thread is ripe for constuctive comments. :-) I like the mulch one so far. But, if the OP only has them on the front of his unit, then diesel dots gets my vote. Unless, the mulch spores are target specific......
What if he's parking it next to a mulch bed on his drivers side rear???
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Old 11-12-2016, 09:37 AM   #7
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Thanks pppitiful for the picture. I should have done the same but thought of posting only after I cleaned off the current batch. Yes, the dots look like pppitiful's picture. And, yes, some of the dots appear on the front and some wind around to the back. It's not likely fungus.

I'd appreciate keeping responses on topic. -thanks
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Old 11-12-2016, 09:58 AM   #8
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I'd appreciate keeping responses on topic. -thanks
So which ones do you think are off-topic?
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Old 11-12-2016, 10:13 AM   #9
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So which ones do you think are off-topic?
I thought fly poop was pretty much in the wrong direction. Unlikely given the circumstances. Sorry if I've offended anyone that is trying to help.
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Old 11-12-2016, 10:22 AM   #10
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Interesting problem. I can't see how it would be semi exhaust. We travel frequently on I-10 between NM and Phoenix which is pretty much one long line of semis. We get passed often as we usually drive 65. No spots on our rig at all, except for bug guts. The artillery fungus is interesting..... Never heard of that before. Learn something every day.

Good luck in finding the culprit!
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