One way to eliminate refrigerator odors is to keep a fresh-standing box of baking soda in the fridge. Other substances that can be used to absorb odors are fresh coffee grinds or unscented cat litter. Keeping the interior of the fridge clean is also important.
When using a box of baking soda, make sure to replace it once every three months. When cleaning the interior of the fridge, a solution of half water and half baking soda or vinegar naturally deodorizes and disinfects. Making sure all refrigerated food is sealed in air-tight containers and removing any packages of food that are past their expiration dates are other ways to combat against unwanted odors.