This can be difficult. I once had to give up a Pentax ME SE because of its odor. I tried, for two weeks, various remedies (baking soda, vinegar, organic deodorizer, keeping it in a zip-lock bag, etc.), but nothing worked. Since then, I am always concerned about funky gear. However, since I buy about 99% of my gear from KEH, this has not been a problem. Only eBay items have been funky. Yet another reason why eBay "bargains" are really just "traps."