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How can I remove the smell from a mothball

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My mother (who has dementia) poured nearly an entire box of moth balls into a heating duct. we only have a small crawl space under our house and there is no way anyone can get back to the area to remove the duct work. My father used the shop vac and removed about 30-35 of them, but when we run the heat the smell is still very pungent. short of paying hundreds to have the someone come and remove the duct work to remove the moth balls, is there any way to remove the smell from the moth balls?