I use a product called Fantastisk Orange Action Commercial Line. I find it at Home Depot. I wet the awning, spray on the orange, roll it up for about 5 or 10 minutes, open up and brush it down with an extended handle soft auto brush. Then rinse off. Done. I also use this product to remove the black streaks and other grunge that you pick up on the road. Just another solution to add to the list.