Things You'll Need
An unused suitcase that is tossed aside in a warm, humid location is a prime target for the growth of mold and mildew. Mold is a type of fungus. Spores of mold in the air attach themselves to surfaces where warmth and moisture are present and eventually grow into a film known as mildew. Mold and mildew create a musty smell. If you detect this smell in a suitcase, you can remove it by eliminating the mold and mildew with common household items.
Take the suitcase outdoors so that you don't spread mold spores indoors while you are cleaning.
Brush areas of visible mold or mildew with a clean toothbrush that you don't plan to use again. This will loosen some of the mold and mildew.
Mix 1 cup white vinegar and 1 cup water. Dip a cleaning sponge into this solution and wipe the suitcase inside and outside.
Allow the suitcase to dry outside in the sunshine before storing it again.