It seems unlikely to me that a dish of baking soda in each drawer is likely
to help much.  It would help if it somehow drew the acid vapors to itself.
But since that doesn't happen, a small dish of baking soda, I would think,
would have the same effect as putting an old, unwanted shell in each drawer.
Acid vapors which reached the baking soda would react with it, and vapors
which reached the shells would still react with them.
Paul M.