I have found one product that works very, very well on all my different travel trailer and 5er awnings. It does take a little effort, but it keeps mold and black from forming. I usually use it in the Spring, when we schedule our first camp-out of the season, and then again near the end of the camping season.
What is it? Mr. Clean Magic Eraser. Oh yea! It takes some work. You'll need to climb a ladder, you'll need to exercise a little. You may get a little wet. But the end result is fantastic.
Dirt, mold, mildew, dead bug stains, just melt away.
How to do it?
Make the Mr. Clean sponge wet, almost dripping. Simply wipe it over a small section of the awning, like 2 feet by 2 feet. Then dry it with a towel. Move over a couple more feet and do the next area, until you've covered the entire awning.
If the first wipe doesn't remove it to your satisfaction, do it a second time. Just remember.... wipe it.... do not scrub with it. And dry off the remaining wet with a towel. That will lift off the rest of the dirt.
The black and mold will not return, for almost, a year. Really. I find by the end of the camping season, my awning is spotted again. Not with mold, but with dead squished bugs. So, through the Summer months, I'll do spot wipes to clean off the bug.
How do I do the top of the awning? I make the Mr. Clean dripping wet. Toss it on top of the awning. I then use a long RV brush with handle and use the brush to move the Eraser around. I'll do a section, then use the long handled brush to wipe down the wet spot with a dry towel. It's a little time consuming, but I've been doing this for 25 years years, on pop-up, travel trailers and fifth wheels, and all my awnings have always looked brilliant white underneath and clean on top.
Now, my 5er has a ladder on the back, and I can do the top side of the awning standing on the roof. I just take a small bucket of water with me topside to keep the Eraser good and wet. I used the brush with long handle to move it around. Works for me. Never a problem.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually