I wonder the cause of the two vertical black stains? The are in virtually the same position on both sides. Smoke from fires?
Simple explanation, and why they’ve come back after the cleaning: they’re stains from the downspouts up above.
I wonder the cause of the two vertical black stains? The are in virtually the same position on both sides. Smoke from fires?
Simple explanation, and why they’ve come back after the cleaning: they’re stains from the downspouts up above.