I have been using a combination of dawn and purple zep for years with no problems. Occasionally I add some bleach when mildew is a problem. The trick is to give the roof a good cleaning a couple times per year and more often if parked under trees.
I found that the side walls stay a lot cleaner if the roof and gutters are cleaned regularly. I avoid wasting $ on high priced treatment products as in my opinion are not necessary.
Steve
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