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Spring cleaning time for my white-painted aluminum horse trailer. I pressure washed the black crud off the fiberglass roof yesterday, and am ready to start on the vertical black streaks on the sides. And I have questions.

1. Preventing or minimizing the black buildup on the roof?

2. Removing the black streaks on the sides?

The manufacturer info says to use 3M rubbing compound on the sides to remove the streaks, and follow with two coats of paste Turtle wax. The manufacturer technique is sure labor intensive. Is there a better way?
 

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The black buildup is most likely algae, the wax should help a little bit, parking under cover would be ideal if you have that option
 

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My neighbor has a red Cadillac with white vinyl top. He tried everything to get black mold/mildew stains off.
This Starbrite stuff worked he got at Walmart.
Liquid Bottle cap Bottle Fluid Drink


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