I would assume take the glazing units out, clean them up and wipe down with mild bleach or something, same for the frames and fit new seals. Might be a sign of poor ventilation or the room having no heating for some time?
@rhowe started
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I would assume take the glazing units out, clean them up and wipe down with mild bleach or something, same for the frames and fit new seals.
Might be a sign of poor ventilation or the room having no heating for some time?