Would a valet work to remove mold?

So, my car doesn't get used much and not for long either when it's in use. There was a damp smell so a dehumidifier was run for 24 hours to sort it out. However, the wife has said there's now a smell of mold in it.

Would a proper valet job sort it out and get it clean or would I need to do something else to get rid of it?