Does anyone know what are those black stains that leaves {tree leaf} leave behind when left on a deck for a few days to a couple of weeks? I thought they were tannins, and now I think it some sort of mildew - but not the kind of mildew that's dies easily with mild bleach solutions. Anyone have a clue? The procedure to remove them seems to mirror some of those really hard composite decks sometimes. I just killed a 9 month old finish removing these stains.
Does anyone know what are those black stains that leaves {tree leaf} leave behind when left on a deck for a few days to a couple of weeks? I thought they were tannins, and now I think it some sort of mildew - but not the kind of mildew that's dies easily with mild bleach solutions. Anyone have a clue? The procedure to remove them seems to mirror some of those really hard composite decks sometimes. I just killed a 9 month old finish removing these stains.
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