I have used it on my composite Timber Tech deck on my house. It said it might take 6 months for the mildew to go away. Actually it worked faster. But there is no scrubbing. U just wet the surface and let it dry. The instructions said to do it on an overcast day when no rain is coming. I never thought about using it on the awning but it makes sense. Did u spray it on your awning and then let it dry?? I would wonder what would happen if u would roll up the awning when wet with this stuff. Probably not a good idea. My instructions said rain will clean my deck after I spray the Wet & Forget on it. If my memory serves me correctly.