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Old 11-12-2016, 10:25 AM   #11
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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
So why do you reject the fungus? Could be coming from where you park your unit.

I think if it was from passing diesel trucks we all would have experienced it at some time in our life and there would be a cleaner advertised on TV for it. I just can't buy the passing diesel truck theory.. Fungus from where you store your RV is plausible but then again I don't know where you store or park your RV.
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Old 11-12-2016, 12:46 PM   #12
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I had this on the driver's side on our 5er. I scraped most off with my thumb nail. Truck exhaust, I'm saying no. The article or blog posted earlier is a match as far as I'm concerned. I might of picked them up in a campground, I don't know. But they haven't been back in over a year and a half.
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Old 11-12-2016, 01:05 PM   #13
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It's the fungus, believe me. Been there, done that! Can be random and come from any place you park. Even for a short time. If it was anything to do with diesel it would not get that hard.
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Old 11-12-2016, 01:21 PM   #14
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Very interesting. I get marroon/rust colored spots on my rig. More noticeable on our old white tt then our current tan fiver but very difficult to get off. Always thought it was some bug or berry thing. Artillery fungus is interesting as we do have mulch at the house and many CG's have mulch.
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Old 11-12-2016, 02:39 PM   #15
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About 10 years ago I was noticing this spotting on our cars. The wife who has an landscaping/horticultural degree said it's sap from the trees. I dismissed it but after washing our cars noticed it was mostly on the sides and not the top surfaces. Google came up with the answer. Many others have had these problems for a long time. Nothing new. Nature is quite inventive, isn't it.
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Old 11-12-2016, 03:29 PM   #16
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Get spots like mentioned when traveling over newly paved or resurfaced roads. Figured tv was kicking it up on the. Plenty of that going on now to beat the cold weather. Seems to be mostly from the oil they used to prime to road surface. The spots I get are easy to removed using a liquid bug and tar remover. Test a small spot first, worked great on fiberglass of Flagstaff tt. I do a small area and imediately wash it good wth rv soap and water.
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Old 11-12-2016, 03:29 PM   #17
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Thank you all for the responses. Interesting potential causes including the fungus. With several posts regarding fungus, it's hard to dismiss. For me, I always notice this right after a trip. Once cleaned, does not re-appear until the next trip. This leads me to believe it's happening while traveling. Where I park is my very open back yard but the driver side is near an untreated wood fence. The substance does seem oily/greasy again pointing to some sort of road grime.

I'll be moving to a brand new home over the winter where I have a dedicated asphalt pad for the motorhome. If it goes away there, credence will be given to the fungus and/or where I park theories.
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Old 11-12-2016, 04:35 PM   #18
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Thank you all for the responses. Interesting potential causes including the fungus. With several posts regarding fungus, it's hard to dismiss. For me, I always notice this right after a trip. Once cleaned, does not re-appear until the next trip. This leads me to believe it's happening while traveling. Where I park is my very open back yard but the driver side is near an untreated wood fence. The substance does seem oily/greasy again pointing to some sort of road grime.

I'll be moving to a brand new home over the winter where I have a dedicated asphalt pad for the motorhome. If it goes away there, credence will be given to the fungus and/or where I park theories.
Well your mind is pretty made up about road grime. I would suggest you check your RV every time you stop to see if you can determine what passed you or what type road you were on. Personally, only time I've picked up bad road grime is when there is road construction and that is pretty much a constant if,on the Interstate.. Good luck on nailing it down...
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Old 11-12-2016, 05:36 PM   #19
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Are you aware of any other Motor home owners that have this same issue? And are Motor homes the only victims?
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Old 11-12-2016, 07:59 PM   #20
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One thought, do you run your generator while underway? Is your generator in the front and exhaust out on the drivers side? Just a thought...
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