Need great idea for washing my Cougar roof

Thanks for your responses! Promise to not get up there! I do have five ladders, accumulated over the years, all are Werner and they are 6, 8, 10, and 12 feet, which is big and sturdy. I have used all of them and feel safe on them. Used the 10-ft to remove the decals on the front, it is really high there. I went to a truck stop years ago and bought a long-handled telescoping brush with a couple of different attachments. It cost a few bucks but works great. So I can use that. A friend said he would go up when dry and check out the air conditioner to be sure there are no leaks in the rubber roofing and look other places I can't see. But he won't wash it! Now I have permission from all of you to not wash it. I will just say "the guys said leave it alone!"