Could be temperature related? What were the overnight lows?
mid-60s or so
I don’t do roofs, but I love reading this thread.
Definitely not temperature related 
what about egg? could it have been egged at some point and never cleaned? egg will turn black.
If they had a Gatling gun egg launcher…it’s all over the place. But that is a definite good insight.
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You’d have bits of shell lodged in the shingles. Had to clean up an egged house last year it was brutal.
You sick man lol.
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I know I’m odd, I just like to read about the deductive reasoning processes people use. If x normally works, and x didn’t work, x plus z didn’t work, yadda yadda yadda.
Without the OP listing the next attempt(s) and whether or not his new chemical/process was a success, I am forced to fill in the blank for myself. It was nice to read about extractive bleeding here.
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Nothing new to report. We may do another test or 2, but if it doesn’t do any better, then we’ll refund and move on. I’m not going to ruin his roof, I’ll eat all the costs and recommend he contact a roofer (or whoever installed it), or something. If what we have doesn’t work, I’ll have to treat it like an oil stain we couldn’t get out.
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Good of you to treat it this way. I’m sorry though that the normal process didn’t work. That’s never fun.
Yep, it’s gonna suck…$1250 revenue, not to mention I’ve already paid 20% of that to the crew, probably 20% in chemicals by the time they got done…and I may owe one guy a little bonus for all his efforts, lol. But hey, I discovered I have a guy who will spend 2 hours on a roof trying like hell to make it right for the client, on a $0 recall that he was getting paid nothing to go back and do…so that’s probably worth the $2k it will wind up costing me in the end 
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So, brief update. Lead tech says to me, “I’m not 100% confident my helper had the cleanout valve set to draw SH”…went out again and it was good to go in 30 minutes, lol.
Upside, a good lesson learned for him in that he should really make sure SH is flowing (and for me, knowing what questions I have to actually ask). Also, priceless discovery about his character, since he spent hours there the first time (yes due to his own mistake), and volunteered to go back and give it another try for the client (again at $0 in commission). You can’t find guys like that everyday.
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He couldn’t smell it?
Nope, because there wasn’t anything but water apparently…and I guess some surfactant 
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