Look online for a product called OdorZout. After my mother passed away, her house had been smoked in heavily for about 33 years and I was faced with dealing with certain books and other objects that had been in there for at least some of that time. I rigged up a 80mm computer fan to blow through a layer of OdorZout granules on cheesecloth and closed all that up with the books etc. in a plastic bin for up to a couple of weeks at a time. The product was effective. If you think you can safely spread the granules around an upturned speaker cone, that might work even better. I really think letting the items and the granules sit in moving air is key.If so what did you use?