best method of washing rubber roof?

Same stuff that is used for sides & doing the truck, Meguires vehicls wash & soft brush followed by 303 protectant twice a year.

I just use my power washer and my head. Next weekend will be my last camping trip for the year then it is roof washing time and hopfully get it buffed before it gets too cold. This is unless the wife talks me into trading before it gets cold.

Thanks to all, these recommendations are well taken, especially about being careful.

Dicor rep at a ralley I attended stated to wash with original Dawn (blue) dish washing detergent.

I use Dicor roof cleaner. Much easier that spic n span. Does a great job and no damage to the roof. No stain on the TT sides. Workers for me.

On my 18 year old roof. I do the same as topjimmy almost.
I use a electric 1700 P.S.I. power washer twice a year with no soap or protectant used.

Twice a year gets that green FL. mold off good. I will do it sometime this month and again in April before my summer trip.

I like to have a DR Pepper as my choice. :)

OH!! All the sides, front & back get washed after the roof twice a year also if needed or not.

While all you folks are washing and scrubbing and treating with this and that I will be done in 20 min with my ELECTRIC 1700 P.S.I. power washer and back down sipping a beer, have been doing this for 3 5th wheels for 10 years and Once a year works GREAT and NO it does not strip the caulking off just the dirt and mildew DO NOT use a Gas powered 2500 P.S.I. + power washer or you will

All or any of the above suggestions are correct. I'll add, use a soft brush and be VERY careful while up there. It gets really slippery and it's a long way to the ground.

I apply the protectant by simply pouring some on the roof and then using a squeegee to spread it. It doesn't take much and the squeegee leaves just enough behind to fill pours and dimples without caking up and drying streaked. Yea, it does mean getting up there and crawling around. But the end result is worth it.

I've used Dawn dish soap for years. Like all have said use lots of water too.