Mold and Mildew
Serious mold requires professional help, as it can cause health problems. But if itís just a musty smell thatís bothering you, run a dehumidifier to pull some of the odor-causing moisture out of the air. Activated charcoal (available at most pet supply or garden stores) will neutralize mold and mildew smells in damp basements and crawl spaces. White vinegar, tea tree oil, and grapefruit seed extract (which can be found at health food stores) are natural fungicides that can be mixed with water and sprayed on mildew. Ground coffee in a (clean) sock, hung in a closet, can also get rid of musty smells.
First, get rid of the source. Clean out food thatís moldy, rotten, old, and smelly, and anything that has changed color or physical state. If it looks like it could walk out of the fridge on its own, into the trash it should go. Wipe down the walls, shelves, and bins with a solution of warm water and white vinegar, and stash an opened box of baking soda in the back to absorb odors. (Replace every few months.)