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1. Thomas Maher says:

   January 1, 2017 at 7:41 AM

   I wonder the cause of the two vertical black stains? The are in virtually the same position on both sides. Smoke from fires?

   Reply
   1. Chris Naffziger says:

      January 2, 2017 at 2:48 PM

      Simple explanation, and why they’ve come back after the cleaning: they’re stains from the downspouts up above.

      Reply

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