Moth balls work because they are made from crystallized naphthalene that evaporates slowly. When stored in an enclosed space they asphyxiate the moth larvae. If stored in an open container the fumes just escape and do nothing but smell up your house.
Cedar is a really myth filled subject but just know that there are true Cedars and others which are commonly called Cedar but are not Cedars. Of all of these only two, the Eastern Aromatic Cedar, (Juniperus virginiana) (which is actually a Juniper) and Red Cedar AKA Cuban Cedar, or Spanish Cedar (Cedrela odorata) (which is actually in the Chinaberry family) are effective against clothes moths. I have seen all types of woods for sale including Western Red and White Cedar. These do nothing but give off a nice smell in your closet.
I have even seen California Redwood sold a Aromatic Cedar.












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