Raise the mattress on its base, doesn’t have to be high just a couple of inches, and lift all furnishings. Open cupboards, lockers, draws etc. Let the air circulate everywhere to the maximum extent. Don’t clean surfaces with Pledge type stuff it encourages mould.
LeeMalin, If your worried about your mattress, and it getting damp I have a Memory foam mattress for a side fixed bed, that zips in the middle, up for grabs FREE. Have a look at the items for sale thread.