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Tony Latonis

Exterior cleaning in Arizona

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You're going to have to do some test spotting with different chemicals. That looks like runoff from the flashing on the 2nd pic. Which means you're probably looking at something that is not biological. On the first picture, I would try SH first as it looks like a shaded side that very well could have growth. But, for the most part, when we bid things like that, we take an arsenal of chemicals to test in small spots. F9 Barc and Efflo, One Restore, etc. Just our $.02.

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