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I had the same problem even though it was treated with Perma Plate. Not happy with Perma Plate. Meguiars make s two product you might try. #49 is a heavy oxidation remover. Use it as directed and more than one application might be reqired. Follow this with #41 High Gloss Polish and apply as directed. These products are made for boats and RV's and are available from marine dealers and Amazon. Mine cleaned up nicely and I am very pleased.
I noticed that where I store the motorhome in Lucerne Valley, high desert, that the local trucking companies have red, white etc. color cabs, fiberglass and these things when not parked are hauling double bulk dumps filled with dry concrete mix. They all and there are probably 100 look beautiful, no oxidation. When the guys were Washington one I asked them what the did, they use Zeb Truck and Trailer Wash period, nothing else. I bought a gallon on line and I am going to try it out. Its a commercial truck was product.
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