Take the swimsuit outside and shake the suit. If the mold doesn't fall off, gently wipe the swimsuit with a broom, newspaper or paper towel to remove the mold. Throw away the newspaper or paper towel once the mold is removed.
Rinse the swimsuit by hand washing in a mixture of water and gentle handwashing detergent or a little bit of your regular detergent. Apply the solution directly to the moldy area. Continue washing until all the mold and soap are removed from the swimsuit.
Dry the swimsuit on a rack in the laundry room or bathroom, or you can leave it to hang dry outside on a sunny day. Don't store the swimsuit until it's completely dry.