When we bought our current trailer our dealer recommended something called Voom. Doesn't eat wax and is safe for all surfaces in and on the RV, yadda, yadda, yadda. Being that I never heard of it I was skeptical. Since I got a decent discount on anything I bought that day I thought why not? It works fine for general cleaning.
I never used it on the awning until this past summer. I always thought the scrub method was best, but I ran out of OxyClean and didn't have time to get more. Wow! This stuff worked great, NO SCRUBBING! A little bit in a gallon of hot water and a wand with terry cloth head and all the stains and mildew came right off.
I will never use anything else to clean the awning with. After our last trip I'll be cleaning the roof with it too.