Did a conservatory this morning. Clean roof, gutters etc. When I came to finish off, I then clean frames and glass as you would a normal clean. I only normally do the house and she leaves the cony. Anyway, as I was scrubbing the frames and glass, black was coming from the seals, but it was like ink. Peeing out of seals for ages. I gave them a good blast with hose pipe, which had a massive pressure. Still dripping as I walked away. I guess its due to knackered seals, but it was never ending. Has anyone come across it before. I am talking running dye not muck