Bigfoot dirty water streaks down sides from roof, solutions?

Rubber roofs degrade especially after 5 years in the sun.

The toy hauler we used to have showed black streaks bad after 10 years. I cleaned the rubber and used a white coating (do not remember the brand now just that it is not made any longer). After calling round I found out Henry silicone roof coating tropical white. After the process no more rubber roof degrading and streaking on the sides.