How can I eliminate bad odors in a refrigerator?

First, empty the refrigerator and discard any spoiled food. Clean all interior surfaces (shelves, drawers, walls) thoroughly with a solution of warm water and baking soda (about 1-2 tablespoons per quart of water) or mild dish soap. Rinse with clean water and dry. Place an open box or bowl of fresh baking soda inside the fridge to absorb lingering odors. Replace the baking soda every few months.

Activated charcoal is highly porous and effective at absorbing odors. Place a container of activated charcoal (available commercially as fridge deodorizers or buy loose charcoal) inside the refrigerator. Like baking soda, it will trap odor molecules. Replace or refresh the charcoal according to product instructions.

After cleaning the fridge, place a bowl of white vinegar or a shallow dish of dry, unused coffee grounds inside for a day or two. Both can help neutralize persistent smells. Remove the bowl/dish afterwards. Ensure all food items are properly sealed to prevent future odor transfer.