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My Montana is a 2010 with the decals that shrink, shrivel and crack and peal. I would not use a power washer on mine. I've watched my dealer washing RV's in the fall blowing the clearance light covers all over the parking lot. I don't think standing on the ground with a power washer is going to be effective on those areas high up that are more than 3 feet away from the wand. I would rather scrub my roof with a brush and not disrupt the caulking with a power wash. And once the window seals get a little older, may not want to get too rough with them. You have to be careful with a brush too as you can get to agressive.
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