pm the murminator, I think he knows of a good way that he saw someone else do along the same track that you are thinking.
I believe it was a bilge pump.
What I'm saying is that spray nine works very well on awnings but combined with a magic eraser it is awesome. There is something about the magic eraser that a rag just dosen't do. P.S.- believe Badss and Modman don't get it on plastics and decals, use gloves.
If anyone needs to clean there RV awning a Mr. Clean magic eraser works great but soaked in the Murminators special sauce (spray nine) it works flipin awesome. Remember don't get it on your decals, they might fade.