The odor you are referring to is most likely caused by decayed broccoli, cauliflower,or lettuce. As they let off a gas that reacts with the poly liner .
You can try a mixture of warm water & vanilla extract wipe out whole ref. Also can put a few pieces of charcoal (do not use the type that has lighter fluid in it) The charcoal will absorb odors.
Now if it were a samsung designed unit that would be a different story because there is a class action lawsuit for the defrost drain design it backs up water under the crisper drawers in the unit and causes a bad chemical smell, but that would not pertain to a whirlpool made unit.
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