Refrigerators should contain some moisture to keep food from drying out. Too much moisture, however, may cause mold or odors to develop or food to decay rapidly. A thorough cleaning is the first step in removing excess moisture, followed by some preventive measures. To prevent excess moisture, run fans to keep the humidity in your home at a reasonable level, and avoid opening and shutting the refrigerator doors frequently.
Clean the refrigerator thoroughly. Remove all of the food and set it aside. Discard food that isn't fresh. Fill a bucket or the sink with warm water, 2 tbsp. liquid dish soap and 1/4 cup chlorine bleach. Wash the refrigerator, racks and bins in the solution, and then rinse and dry the surfaces. Remove the pan under the refrigerator, if your model has one, and discard any drippings. Vacuum the coils under the refrigerator with the brush attachment of your vacuum cleaner. Keeping the coils clean allows the refrigerator to operate more efficiently, removing excess moisture.
Place a desiccant dehumidifier in the refrigerator to absorb moisture. These products contain moisture-absorbing minerals that also remove odors and ethylene gas. You can buy these products online or at appliance and hardware stores.
Prevent moisture from building up inside the refrigerator by storing food in covered containers. Leave at least 1 inch between each container to allow air to circulate freely throughout the refrigerator. Use a refrigerator thermometer to ensure that temperatures inside the fridge stay between 34 and 40 degrees Fahrenheit.