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Old 06-13-2020, 03:44 PM   #1
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2018 33' Classic
Loveland , Ohio
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Wondering if the small circular shaped white spots on certain sections of my coach (2018 Classic) are caused by oxidation? Looking for recommendations for how best to remove these spots. Iíve seen posts referencing vinegar and water mixture.
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Old 06-13-2020, 04:29 PM   #2
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Old 06-13-2020, 07:27 PM   #3
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No it isn't oxidation on a 2018. Aluminum oxidation typically occurs on vintage trailers - it turns them from "bright & shiny" aluminum, to a dull flat grey.

"Vintage" trailers either have failing clear coat, no clearcoat ever or stripped aluminum which allows the elements to oxidize and it turn dull. If it looks splotchy (like a sunburn) it has failed clearcoat - as the clear coat fails, it oxidizes in phases over years, which causes the splotches.

"Modern" trailers have a thicker plastic-coat that is supposed to protect the aluminum from oxidizing. Your photo looks like it might be just hard water spots on the plastic-coat, in which case, vinegar/water will help remove them - as will Walbernize or a spray-on car wash formula you would use on your car.

If it is a white crusty/powdery residue, it could be the start of filiform corrosion where tiny breeches in the plasti-coat film has allowed water to get in behind it. The resulting moisture can't escape and the aluminum starts to corrode - which is what causes the crusty/powdery residue.

I would try the vinegar/water in a small area - if it works, then proceed with the whole trailer.

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Old 06-14-2020, 10:54 AM   #4
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Try washing with a quality car wash soap and microfiber wash mitt.(Horizontal strokes with the 'grain')

Keep us posted...


The arrow points to a possible start of filiform corrosion...better close-up needed.
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