Home DIY

This was my suspicion. But I'm buggered if I can think of any way to sort it because of the poor access. Currently thinking about a bodge: fill holes, paint over stain and fit a new fan. Then see what happens. Not ideal though.

You might need a centrifugal extractor rather than whatever the other kind are. Think these will move the moisture further away. That's what one of the sparks told me when he came to quote for an extractor for us.