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Mould.
(feddit.uk)
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This is really good advice. We have to do this every year as well. I would add that if you can air the room / flat out for an hour in the morning to let the air circulate that would be good as well. Easier said than done when it gets colder and rainy though.
Ah yeah, good addition. We open our bedroom window as soon as we get up and will often shut that room off to its own cold existence for at least half the day as that is our worst room.