There are a several things you can do to minimize the stains on the side of the coach from roof runoff.
First, make sure you keep the roof clean, otherwise even the moisture from a dew will cause the junk on the roof to run down the sides.
Secondly, check to see if the paint on the roof is badly oxidized. This will result in a chalky film that will wash over the side.
Thirdly, keep the roof of the coach waxed. This will protect the roof and minimize the need to fight with cleaning runoff from the sides.
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