Throw out old, moldy or expired food. Toss anything you don’t use regularly, too.
Just pour some baking soda in a bucket of warm water. Wipe your refrigerator inside and outside with a cloth and baking soda water solution, rinsing well with a washcloth and water. For sticky stains pour the baking soda directly on the area and scrub with a wet rag. Baking soda is a very mild abrasive so it won’t scratch. It works great to clean and deodorize.
Cut one or two lemons and squeeze the juice into a small pail of water. Throw the remains of the cut lemon slices into the water and give it good stir. Use the lemon water to give another wipe on the inside of my refrigerator. It works great, leaves a clean fresh lemon scent and you don’t have to worry about using it around food stuffs.
Keep your refrigerator organized, with meats and cheese and butter in one shelve box, and vegetables in the crisper.
Place a open box of baking soda in the fridge to adsorb exess moisture and smell. Alternatively, you can also place used coffee grounds in the fridge and/or the freezer to remove odors. You need to change the grounds once a month. It worked for the fish odor that had been my problem.