Dehumidifier (ideally 10L to 20L) (Bicton Heath SY3)

My daughter's new room at uni has lots of black mould on the wall behind the wardrobe. I've treated it but to try and prevent it coming back, I'm after any working dehumidifier if anyone is gifting one, please?

(We've already tried the dessicant type granules / containers etc. and there's good airflow in the room.)
Can you help with this request?
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