I have a 2015 Alpine 5th wheel. It was at the repair shop for 4 months after returning from a 3 month trip this winter in UT. When we brought the trailer home the awning which is white on the unders...
I just read on the RV Travel newsletter to use an RV awning cleaner, wet thoroughly, then roll it up and let sit for several hours, unroll and rinse off. I haven't tried this but it sure makes sense to me. I was ready to try this today since we were rinsing off the slide out awnings and cleaning the roof after returning from a trip, but am out of awning cleaner.