I have used Awesome on the roof. It works OK. Clorox Cleanup
works better on the roof. Wear old clothes, the bleach will ruin any fabric with color.
If you use Awesome on the trailer, be aware that it will remove any wax you've applied. You need to reapply wax after using Awesome.
I wash the trailer sidewalls with Awesome, 24 oz to 2 gallons of water, prior to waxing the trailer to remove the old wax and black streaks.
'13 Excel Winslow 34IKE
'12 GMC Sierra 3500HD
Previous RV's: '03 MobileScout Titan 29DBS; '01 Sunnybrook Lite 2708 SLE; '99 Coleman Utah
Previous TV's: '02 Chevy Suburban 2500 8.1 4.10; '99 Chevy Express 1500 5.7