Mold, Mildew or Musty Odors
Nothing looks worse in your refrigerator than a growth of ugly black, yellow or green mildew! You can kill and prevent mildew by wiping the inside of your refrigerator with pure white vinegar. Vinegar discourages and prevents the growth of mildew, molds and other undesirable bacteria. After application of vinegar, wipe the surface with a clean, damp rag and dry thoroughly
Deep Cleaning Your Refrigerator
For detailed instructions on a thorough preventive maintenance cleaning of your refrigerator, see deep refrigerator cleaning
Refer to manufacturer's instructions on cleaning frost-free freezer units. Some have easily accessible drain holes that you can check for cleanliness and clogs, but some manufacturers don't mean for you to get that involved. Best to check your manual and then follow the recommendations. (If you no longer have the owner's manual, you may find it on line by going to the manufacturer's web site. Be sure you know the make and model number of your appliance.)
Using a soft cloth or household sponge dipped in hot soapy water, wipe down the surface of your refrigerator being sure to include the top of the appliance. Use a sanitizer cleaner on and around the door handle.
Enlisting the aid of a helper, move the refrigerator out of its place every now and then to vacuum the coils on the back and clean out from under. Remove the louvered ventilation panel which is usually found in the front, under the door of the appliance and wash it. Use your vacuum tools to suck up the dust and debris that settles on the coils. If there's a drip pan, wash it well, dry it and spray with a sanitizer before replacing.
If you need to store an unused refrigerator, remove all food, clean and sanitize the inside. Remove the door -- never leave the door on a refrigerator that is not being used! Children find old refrigerators as wonderful places to play. If one gets inside and the door accidentally closes, there is no way out. It's extreme negligence to allow this potential hazard to exist when it can be easily avoided by just taking the door off! Hinges and hinge pins can be put inside a plastic bag and taped to the door. Sprinkle activated charcoal on the bottom to absorb odors.
Don't use empty refrigerators as storage units for other items unless they are very light. Don't store anything that can damage interior walls, or that could contaminate food, such as weed killer, fertilizers, etc., in case you decide to use the refrigerator again