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Our roof material (TPO) is made by Dicor which recommends you clean and condition it twice a year with their roof cleaner and spot clean areas that need repair or touch-up with denatured alcohol.
I agree that blue Dawn will do the trick for 99% of your cleaning needs, roof included.
this forum seems to be 50/50 on total neglect and regular maintenance of the roof. At a minimum you should inspect and repair as needed twice a year.
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