Mr. Clean Magic Eraser. Make wet, simply wipe a small section at a time (no need to scrub), use a dry cloth and wipe off. Then move to next small section. A little time consuming, yes.But the end results are amazing, and Mr. Clean puts a chemical on the awning that will retard black from coming back for a long time. It won't help when bugs get rolled up, but a little touch-up of Mr. Clean and they come right off. Will not hurt the awning.
To clean the top of mine (since mine is electric retractable), I use a picnic table at the campground and use it for a ladder (I can stand on it safely and it's a nice firm foundation). Put it along the edge of the awning. I then use a long painter's wand (collapsible) with a soft RV brush. I wrap the brush with a wet towel, and put the Mr. Clean between the towel and the awning, use the brush to move it around (up and down). There again, small sections at a time, follow up with a dry cloth.
There again, a little time consuming, but you won't have to touch the awning again for another year.
Edit: I'm reluctant to use any solvents that are designed to remove grease an oil, like dishwashing liquid. It might never happen, but I am paranoid about the cleaning solution cleaning too good, and removing the oils and chemiclas that actually the awning is actually made from. And also do not want to use bleach. First, I don't want the fabric bleached out pale, and second, if the bleach is not rinsed completely, there's a chance the bleach can deteriorate the awning. (Do this test, if you never done it before. Get a little bleach and put an old sock or T-shirt in it. Let it sit over night. Take the item out and rinse it out. I think you'll find the item is now beginning to shred. My awning costs too much, I don't want to take that chance.)
