If you're not worried about the inside being squeeky clean I'd shake out a half a box of baking sode in the case and keep it shut a few days. You'll never get all the baking sode out but it won't harm the bow any. Another idea was a couple of years age my mother got me a mesh bag filled with small chunks of carbon. She thought it would be good to get odors out of my car but I bet it would work in your bow case. I'll see if I can fine where she got them. (I thnk out of hariett carter mail order mag but I'm not sure)