Purchase woolens or woolen synthetic blends that have already been treated by the manufacturer with a moth-resistant compound. Brush woolen clothing often to remove insects and their eggs. You need one pound of crystals or balls for each 100 cubic feet of space. As the chemical evaporates, the vapor kills both clothes moths and carpet beetles. If storing woolens in a closet without placing them into containers, see that the closet is tightly sealed.
Protection is lost if the closet door is opened frequently.
Because the vapors are heavier than air, the chemicals should be placed in a shallow container on a shelf, or suspended from a clothes rod or hook in a thin cloth bag or perforated container. Cedar Closets and Chests Heavy and tightly constructed cedar closets and chests can be the ultimate luxury in storage. If they are thin and loosely constructed, they can smell good and still be worth no more than cardboard boxes. The concentration of volatile oil in the heartwood of cedar kills moth larvae, but the smell does not repel them. Cedar chips, sprays, and oils applied to cardboard or wood containers lack sufficient concentrations of the oil and lose what they do have through evaporation.