I use SimpleGreen diluted down . I wet the awning top and underside, then spray the SimpleGreen solution on the awning both sides. I roll the awning closed, and let it sit for a little while. Unroll it use a soft bristle brush to scrub it. Rinse it off and let it dry. Always had good results..
2016 Ford F-250 Lariat 6.7L V8 Diesel
2013 Jayco Whitehawk 26DSRB