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Spread baking soda out on shallow pans (like shallow glass casseroles, pie plates, or jelly roll pans lined with foil) and put pans on shelves to absorb odors, or on the bottom and in baskets of chest freezer. Leave open and unplugged.
Buy activated charcoal (which is specially treated to remove odor molecules from air) at some department store housewares sections, appliance stores, or pet shops. Spread out on shallow pans and put on shelves of refrigerator. Turn refrigerator on low setting and run empty a few days so odors will be absorbed.
Spread cat litter in shallow pan in cabinet, turn on and run empty a few days. If odor is disappearing but is not all gone, replace old litter with fresh litter.
Pour several ounces imitation vanilla (not pure extract) in a shallow saucer, put on shelf and let run empty a few days.
Put fresh ground coffee in cereal bowls inside the refrigerator and let run empty several days. A slight coffee odor may remain, but will disappear after washing again with baking soda solution.
Pack each refrigerator shelf with crumpled newspaper. Set a cup of water on the top shelf or sprinkle the newspaper lightly with water. Allow refrigerator to run for approximately 5-6 days. This method takes a bit longer but has been effective in removal of strong odors.
Two other unconventional liquids that have been used successfully to wash refrigerators and freezers are tomato juice and any of the cola drinks. Use either the tomato juice or the cola undiluted; rinse thoroughly.
If odor persists, wash with a solution of 1 teaspoon baking soda to each quart of warm water, or I cup vinegar or household ammonia to a gallon of water.