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Old 03-19-2023, 06:30 AM   #1
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black spots on exterior after removing cover

Need a little help. We just removed the cover off our Alante 29f today and the exterior walls had dark spots all over. I washed the motorhome with an automotive car wash prior to putting the cover on it two months ago. I found a spot that was not too conspicuous and tried numerous products, (409, bleach, scum remover, and dawn platinum) to remove them. Dawn platinum worked with a hard scrubbing, but I read that dishwashing soap shouldn't be used on the sides, only the roof. Has anyone run across this problem and if so, were you able to find a solution? Any help would be greatly appreciated
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Old 03-19-2023, 06:38 AM   #2
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Do they look like mold spots? Can you post a picture? Dawn dish soap is a great product but it will remove any protective layer(s) of wax that you have in place. The other product I would try would be "Totally Awsome" cleaner. I get it at the dollar stores. It's too is a great cleaner but will strip any wax from the vehicle. I dilute it down quite a bit and use it sparingly.

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Old 03-19-2023, 06:51 AM   #3
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Agree that dish soap will remove any wax from the surface. I have used Simple Green with good success and it is safe to use anywhere. Best results are when you spray it on and let it soak in for a few minutes before scrubbing.

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Old 03-19-2023, 09:23 AM   #4
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"Simple Green is safe on car paint. However, it shouldn’t be allowed to sit or dry on car paint as it will eat through the car’s clear coat. This coat is responsible for protecting your paint from UV rays, scratches, and other elements."

A couple of things here: Your clear coat may already be compromised by mold. The clear coat on these RVs is really thin. Lots of rubbing, grinding whatever is likely to remove what little is there.

Let's hope that is not the case but I would be careful before I got carried away with chemicals. Dawn is pretty harmless and re-waxing your RV is going to be the least of your worries should the clear coat be further damaged.
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black spots, exterior stains, exterior wall cleaners, mildew

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