Water Stains

[shmoov69]

To stop it from happening again after you get it clean, go to a roofing supply store and buy some WHITE elastomeric coating and coat the roof of your trailer. Don't get the cheap crap from a lumber yard or wally's, get some good stuff that the roofing supply reccomends. Actually Home Depot has a contract with GAF materials and they might have some "Topcoat" (brand name) there that will do good. The cheap stuff will not last and will peel like a mofo and be a waste of $. The key to making it work is to pressure wash the roof and get it really clean and really dry. Make sure to read the can to see about the application temps also. Too cold and it will not dry properly. This should eliminate any more streaking of the sides of the trailer, and also make it ALOT cooler inside in the summer.
BTW-I am a roofer!