I have tried several products but can't remove grime from the underside of my awning. looks like mildew. the awning was in closed position for 3+ months and was not cleaned after last trip (a lesson ...
On mine, the awning cleaner that was supposed to be safe and wonderful from Glamping World was safe (awning did not dissolve) but definitely not wonderful. Much better results with bleach, water and a bit of Dawn in a 1 gallon sprayer.