My neighbor asked me last week why her fridge smells like a gym bag no matter what she does. She had tried one of those charcoal packs and replaced it twice. Still bad.

The truth is, no deodorizer fixes a dirty fridge. They just cover the smell. The fix starts with finding what is actually causing it.

Hunt down the source first

Smell every shelf. Check the crisper drawers, the door bins, and especially the back corners. In my fridge it was a forgotten bag of wilted spinach that had turned to slime. Pull everything out, toss anything past its date, and wipe the shelves down with warm soapy water. Most smell problems die right here.

Then bring in the baking soda

An open box of baking soda in the back of a shelf absorbs odors for about three months. The key is the date. Write the month on the box with a marker so you remember to swap it. A box from last year is just taking up space.

Things you already have that work too

• Dry coffee grounds in a small open bowl. They soak up smells and leave a faint coffee scent.
• Lemon or orange peels in a dish. They smell great for a week, then swap them out.
• Vanilla extract on a cotton ball in a tiny jar with holes poked in the lid. It is a classic bakery trick.

I rotate between coffee grounds and baking soda, depending on what I have around. Both work.

Stop the smell from coming back

Two habits fix most recurring fridge smells. First, keep an eye on the crisper drawers, because that is where produce rots in secret. Second, wipe up spills when they happen instead of waiting for the weekly clean. A dried spill of juice or sauce is basically glue for bacteria.

If the smell survives all of this, check the drip pan underneath the fridge and the rubber seals on the door. Those two spots hide mold like crazy. My neighbor found a science experiment growing in her drip pan. A little vinegar and a scrub brush fixed it in ten minutes.