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Hmmmm, never saw anything like that. However [don't want to be the bad guy here] but I can see some runs, from the chemical applied and it looks obvious to me, that the chemical application is the cause of the different coloration. If this person were not a veteran roof cleaner, I'd guess he tried a new chem - perhaps one with de-greaser properties etc and that caused the starting area to discolor?
I honestly can't see the roofing manufacturer being at fault. If it was soot, it should be happening to others regularly and that still wouldn't put the roofing manufacturer at fault.
I wish I had an answer, that I could honestly guess at with my years of experience, that would get the roof cleaner off the hook. But I don't see one?
Sorry,
Chuck

Troy Layman wrote:

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Hello all,

First post for me on this forum. I'm new to the industry and have been posting on the SoftWashing forums for a few weeks, but I am all about getting education where ever I can. I was wondering if there was any follow up to this issue? Is it possible the company that supplied his SH may have gotten their chemicals mixed up, or perhaps the home owner (or previous home owner) may have applied one of those roof sealants/coatings that could have reacted with the SH to cause this?

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 No Trpy, it is still a mystery as to what happened to this roof, but do not let an isolated case like this stop you from a future in the roof cleaning business.