I clean the top side by rolling the awning out in 2 to 3 foot increments, then using ladder and long handle brush cleaning that exposed area. Continue in increments by rolling out another 2 to 3 feet, until entire top is finished. A little more challenging to clean the bottom side. I have the awning completely out, then just get underneath again with long handle brush and clean away (I also get a good dousing while doing this. It's best done on a hot day so as to get some benefit to getting wet). As far as a cleaning solution, a bucket full of water and some dish detergent (Dawn, Dove, etc.) and depending if there is any mildew on the fabric a cap full or two of bleach. That is my technique.
I took soap and water on the underside with a long handled soft brush. Scrub it all good and then roll it up we with the soap and water still on it. As you roll it up the underside will wet the top side. Leave it closed for about 10 minutes. Then open it up and rinse bot top and bottom with clean water from the hose. Leave open to dry. It works for us. I found this method out in the Trailer Life magazine, tried it and it works. It is simple and quick.
I took soap and water on the underside with a long handled soft brush. Scrub it all good and then roll it up we with the soap and water still on it. As you roll it up the underside will wet the top side. Leave it closed for about 10 minutes. Then open it up and rinse bot top and bottom with clean water from the hose. Leave open to dry. It works for us. I found this method out in the Trailer Life magazine, tried it and it works. It is simple and quick.