If it’s white and has the black mold spots, you can soak it in janola for 2 days and that normally works.
If it’s leather and it has the green wipable mold:- now you might not agree with me but I find that washing it helps get rid of it.
If it’s coloured clothing with black mold spots you can try using clothing dye to get the full colour back.

If none of the above works for you, then I’m really sorry.