Check the freezer thermometer. When the thermometer has a temperature higher than 40 degrees Fahrenheit, examine all the food carefully. Discard all meats that have a change in color or odor.
Remove all the food from the freezer before you clean it. Store any salvageable foods that show no signs of spoilage in an ice cooler with dry ice or a neighbor’s freezer while you clean the appliance.
Remove all the shelves and drawers from the freezer. Wash them in warm, soapy water. Rinse the removable shelves and drawers and dry them thoroughly.
Unplug the freezer unit from the wall. Clean the freezer with a solution that contains 1 qt. of warm water and 2 tbsp. of baking soda. Wipe down the interior surface and rinse it with warm water.
Pour baking soda onto cookie sheets. Sit the baking soda in the freezer for 12 to 24 hours to absorb lingering odors.
Open the freezer door while the unit remains unplugged to remove stubborn odors. Let the freezer air out for two to three days.
Pack the appliance with crumpled newspapers and sprinkle them with water lightly if an odor remains. Plug the freezer back into the wall and run it for a week to absorb any odors.
Place the shelves and drawers back into the freezer. Return the food to the freezer.