New (to us) fifth wheel

ScottG wrote:
The best thing you can do for the roof is leave it alone. Cleaning makes them look nice but every time it's cleaned you remove a little of the white protective layer. After that is gone the rubber underneath quickly deteriorates.
It's a commercial roofing product that's meant to be installed and forgot about.

I totally agree! We had a park trailer for 10 years on a seasonal site in MN. It sat outside all year around. Maybe washed it twice in 10 years, never treated it with anything. Checked the caulk annually and touched it up a few times. No problems of any kind. The roof still looked good when we sold it. I think it's best if you just leave them alone.

B.O.