Camping trailers!

You can use any truck washing soap. You will want to dilute it down a bit. This is a big market for waxes and sealers. They will help you to make the sale.

Scott
 
And for the black streaks often found on the sides, a gutter cleaner like Gutter Zap will do the trick. Or any other product designed to break the static bond that makes those dang black streaks so tough to remove.
 
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