Depends on the area you live. Around here I generally park under trees so pollen and such builds up so I wash my roof frequently) 3 to 4 times year. In my opinion, this helps keep sides clean and black streaks to minimum. Because I keep it clean, I just use dish soap and a soft brush and occasional touch of bleach to keep mildew in check.
If you only wash it once per year or so, some of the rv roof cleaners may give you better results.
Remember what is most important is keeping regular inspection intervals and check all caulk seams very closely for hairline cracks and/or pinholes and reapply dicor caulk as needed. Very important.
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