To remove musty smells from old books insert books into plastic bags, insert a fabric softener sheet, close bag, and let set for a day of so. Can also insert a sheet of fabric softener between the pages of each book and leave there indefinitely. this should work quite nicely. For really stubborn smells place books into plastic container, use a container with a tight fitting lid, place books in, set a cup of ammonia on top, seal as tightly as possible, let set for a while, this should remove all odors.
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