18 months ago, we moved to a brand new house that had a utility room. It has now developed a horrible musty smell that won't go away. There is a fan in there that we run whenever the washing machine or tumble drier is going; I have taken everything out of there over the weekend and given the whole place a really good scrub and airing (including under the machines), and I have had the back door open to air it -- a slight reduction smell wise, but it is still there.
What to do?
PS I know this is minor in the whole scope of life, but I am hoping someone will have some wise words as usual that will help me out. Thanks!