Living in the Portland, OR area, there is a lot of emphasis on environmentally safe treatments. Using the roof and excessive moss and black algae as an example. Does anyone have any take on WashSafe Roof Wash or any other eco friendly chemistry and or is it just better to stick with the chemical solutions commonly used? Basically, is there an eco friendly wash detergent that can really do the job, without the worries of bleach streaking and such?
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