Smelly Humidor ?

The last box of Arm and Hammer baking soda I purchased had a pull off side with a membrane underneath to keep the baking soda in the box. I used it in my Vinotemp to get rid of the plastic odor when I first got it. But, putting it in a tray or on a small paper plate or bowl insid a closed humidor may provide more surface area to absorb the undesired "flavors".