Fridge still smells after cleaning? Soak a cotton swab in vanilla and leave it inside for 24 hours: This little-known trick targets lingering odors

You've cleaned every shelf. You've thrown away the old leftovers. Yet the smell hits you again as soon as you open the fridge. Before you run out to buy another box of baking soda, try a trick using things you might already have in your kitchen. University of Illinois Extension suggests soaking a cotton swab in vanilla, putting it in the refrigerator or freezer, and leaving the door shut for 24 hours.

This tip is also mentioned by official sources. The USDA's Food Safety and Inspection Service gives the same advice in its guide to removing odors from refrigerators and freezers and recommends checking for odors after 24 hours. So there is real substance behind the tip. But it works best as a final step, not the first one.

Start with a thorough cleaning


There is usually a source of the smell, and Illinois Extension says to start there. It suggests washing shelves, drawers, and other removable parts in hot, soapy water in its handout. While you work, it recommends storing perishable foods in a cooler and throwing away anything spoiled or questionable. The USDA guide gives the same instruction for shelves, crispers, and ice trays, which should be washed well with hot water and detergent.

Next is the interior. The Illinois handout recommends cleaning removable parts by soaking them in a solution of 1 tablespoon of regular, unscented household bleach and 1 gallon of water, and then letting them air dry. For the doors and interior, it suggests washing with 2 teaspoons of baking soda in 1 quart of water, followed by a rinse with a bleach solution. Then leave the door open for 15 minutes so everything can air-dry, and reinstall the shelves and drawers before you refill the fridge.

How to do the vanilla trick

Once the fridge is clean and dry, the steps are easy to follow: soak a cotton swab in vanilla, close it inside for a full day, then check for odors. Both guides recommend this for refrigerators and freezers alike. If you can still smell it, then it's time to try something else.

Is it masking the smell?

This is where most tips go wrong. The guides do not tell you why vanilla helps. One idea is odor masking, where a pleasant smell masks a bad one. The idea was tested in a study published in Frontiers in Neuroscience. Researchers combined a lemon-like scent with a small amount of a foul, goat-like odor. The study found that people found the mixture as pleasant and as strong as the pure lemon scent and could not tell the difference between the two in a forced-choice test. Still, brain imaging revealed the two odors were processed differently. Because the study did not involve vanilla or a refrigerator, it cannot tell us whether the swab is effective. It only suggests that a masked smell can be a part of the blend. The masking hypothesis is just a possibility, not a fact.

Pair it with other quick fixes

Illinois Extension lists a few more choices. One is cleaning the fridge with a mixture of water and vinegar to kill mildew. Another is to place a large shallow container of fresh coffee grounds or baking soda on the bottom of the fridge. The USDA also includes the coffee grounds and baking soda tips. For more stubborn smells, both sources recommend rolled newspapers. Place them inside, close the doors, and wait a few days. Then take off the paper and clean with vinegar and water.

When the odor persists

Some odors last a long time. The USDA guide covers odors from food spoilage, such as from a power outage, flood, or unit failure, and states these can be hard to get out and that the process may have to be repeated several times. The page also mentions using a commercial product from a hardware or housewares store, as long as you follow the manufacturer's instructions. In the worst-case scenario, it might be necessary to throw away the refrigerator or freezer. This guide advises making sure the appliance is childproofed so that children cannot lock themselves inside. The surest way is to take the door off.

So, is the vanilla swab worth trying?

Vanilla can't fix a dirty fridge. Start with a hot, soapy scrub, clear away old food, and let everything dry. Try the swab for 24 hours and check the air. If the smell persists, try vinegar, coffee grounds, or baking soda and clean out the fridge again. It is a small step recommended by a university extension program and a federal food safety agency. So, the next time your nose meets this familiar smell, this trick could be worth a shot.