Once you get rid of the mould you need to figure out ways to stop it from coming back. Good ventilation is needed, leave a few windows open a wee bit, or wide open on a sunny winter day. don't have any furniture pushed against the wall, leave a gap
My car gets wet in the winter I put that crystal-type cat litter into tights/socks knot them and leave them in the car and it stops the inside from being wet. I don't need it in the home as always have a window open and no internal doors closed.
Mould is dangerous and why most housing when they change the windows now put in lots of ventilation slots. mould in homes was not a problem before central heating now it is huge, especially now when people dry washing on rads and we wash our clothes much more than we once did because of the convenience of automatic washing machines. Before that people only washed dirty things, not after every wear.