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it was on the bedroom window, but I think I must have released the poison from the spores because that night...I got a sore throat!
Tiny top floor flat, all double glazed and no neighbours on either side (which makes a difference so I'm told, walls are colder). Drying washing and the general layout without any ventilation meant the walls and stuff in cupboards all went black. Wiping it off improves things for a time but apparently it spreads the spores around and makes things worse in future. We moved out in the end.