I use a cordless Worx 20V leaf blower. It won't scrape the membrane with debris. This can be done from a small ladder so you don't have to go up on the roof.
Mule: 2016 RAM Mega Cab Dually, 4X4, Demco Hijacker 21K Autoslide on RAM Puck, Laramie, 6.7, Aisin, 4:10's, Loaded
Wagon: 2015 Pinnacle 38FLSA, Sailun G's, Center Point Air Suspension, 572 Watts Solar w/4 T-145s.