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I check the caulking before and after winter storage, and clear the snow off during the winter. Most I have ever done to the roof and awning is hose them off. There is no lack of Dawn around our house so I assume that will get the dark marks off.
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Mike
2016 Ford F350 CC 6.7 4x4 SRW (Ghost Rider)
2017 Cougar 29 RKSWE (The Tumble Weed)
Connected by a Curt 15K WDH W/Sway Control
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