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CYOA
Howard
If it's a room that isn't in constant use I'd be tempted to remove all the sources of moisture, seal the room as best as possible, then make it very, very dry with as you say a dehumidifier. Once it's been dry for long enough to prevent growth I'd consider how to remove the existing (and probably now dead) mould.
Might not be achievable until you remove any sources of external damp though.