I just have always used any unscented cheap dish soap. I don't try to take a bucket and all that up on the roof, just the hose, my long handled brush, and squirt bottle of soap. Also, I only do my roof maybe twice a year and that is just to cut down on black streaks running down the side of my coach.
What I do pay attention to is my plastic vent and air conditioner covers. I clean and then coat them with 303 protectant 4 or 5 times a year.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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