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Old 10-30-2016, 06:23 PM   #1
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Yellowish on side of motorhome

Hello, recently purchased 2008 motorhome and trying to get it clean and shining again. The sides are discolored yellow, assuming from sun etc, At the very top under awning can see the white it use to be. Will Meguiars heavy oxidation remover remove yellow like this or does anyone have any suggestions? Would a normal car wax job take it off, also saw marine31 has a oxidation remover product for fiberglass, saw where LA awesome cleaner was mentioned online but afraid it will do damage? Or if anyone knows of any wipe on and off products. Attached is photo, thank you in advance for any help.
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Old 10-30-2016, 06:51 PM   #2
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Interesting. Wonder if someone may have applied Zep or something similar to it in lieu of waxing and what you are seeing is the normal yellowing that can happen and especially visible on a white coach. Just my 2 cents.

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Old 10-30-2016, 06:56 PM   #3
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I have had great results using this product for yellow oxidation on my white Class C
Works great both hand rubbed or electric buffed.....👍

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Old 10-31-2016, 06:16 AM   #4
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If the previous owner was the lazy type and applied one of the "miracle finishes" disguised as floor wax and sold under many names, you can try a small area by wiping it with full strength ammonia. If it is floor wax, it will start to dissolve. Then you can use something like Meguires products to restore the finish.
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Old 10-31-2016, 06:48 AM   #5
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Our last 5th wheel, purchased used had that problem. The nose cap was chalky yellow, the rear cap mot much better. The nose cap needed to be wet sanded with 1000 grit then 2000 grit paper, then buffed to a shine then 7 coats of Poli-Glow to seal and maintain it. That was drastic and not recommended unless you know how to do this operation.

If it isn't too bad, possibly something like Presta 1500, machine applied, then their swirl coat may bring it back. This is a professional product but can be used by anyone with care (Ultra Buffing System) but does need a variable speed buffer and foam pads to get good results.

There are other great products like the Meguire's pro level that will work as well.

Doing it by hand will only wear you out with mixed results plus a sore arm. A good body shop may do it for a reasonable cost too and might be your best bet.
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Old 11-02-2016, 04:09 PM   #6
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Thank you all for the responses! Tried Ammonia, did nothing. It's clean but is yellow! Contemplating on what to try next...if it will come out with machine. if there's any hope in getting back to white.
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Old 11-03-2016, 06:42 AM   #7
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Some fiberglasses and plastics yellow in the sun. If so, the discoloring is throughout the material itself and not just surface, so no amount of polishing will remove it. Try a heavy duty polish like the Meguiars (or plain old rubbing compound) and see if it works, but I would not be optimistic about your problem.

Oxidation is not typically yellow. It is more of a haze than a color.
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Old 11-03-2016, 03:25 PM   #8
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White fiberglass can yellow if no wax or sealer has been applied. Try some Bar Keepers Friend and mild abrasive pad. Like a scrubbing pad for dishes. Try a small area and see if comes out whiter. I know ours has yellowed. I used scrubbing pad to remove some stains and can see that area is whiter now.

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