I had a piece of antique furniture that had an awful odor in the drawers and cabinets underneath. Citrus cleaner was the only thing that helped and it finally got rid of the smell.
After you clean it, you might try putting it back in the case with cotton balls soaked in the citrus cleaner. That can sometimes get rid of smells. Something else I had good luck with in my house was Febreze. It helped a lot.