I have a problem with molds in my kitchen wares and shirts. I am thankful to the Good Housekeeping magazine for the tips on how to remove them. I hope it will also help you. Molds are living organism that thrive in moist and warm places. Perhaps your closet was damped and this encouraged their growth. Several pieces of charcoal or an open box of baking soda placed inside the cabinets will work to absorb the moisture and discourage mold infestation. To clean belts and black shirt with molds, take them outdoors and brush thoroughly the molds off. Hang them out to dry in the hot sun. You could also run a cloth dampened with a little chlorine bleach over the items before drying.