I believe it just moisture that collects from rain and if your not unrolling it, it never gets to dry out. Very typical.
I use Camco Wash and Wax, available from amazon and Walmart for about $5 to wash both the camper, roof and the awning with a medium stiff brush on a telescoping handle. Mild pressure and it cleans up nicely. I do my camper once in the spring and once in the fall.
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2020 Chevrolet 2500 LTZ, 2019 Forest River Wolfpack 23Pack15, 2014 EZGO Golf Cart.
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