I too have the same problem with our travel trailer, I have black spots right were the roof trusses are. It goes from the rear to the front of roof. I had a rv shop here near me and well trusted, cleaned it twice with no results. So now I have a service manager at camping world putting in a claim, waiting to hear from them. My camper is a 2016 Outback 316RL
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2016 Keystone Outback 316RL
2016 Ford F-250 Lariat 6.7 CC SB
2019 Ford Edge ST 2.7 L w/ twin turbo's
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