Baking soda scrubs, vinegar deodorizes. That's the whole trick.

To deep-clean a lunch box, don’t mix baking soda and vinegar into a foam—use them one after the other. Mixing looks cool but basically cancels both out. The fizz is just carbon dioxide, and you’re left with salty water.

Here’s the actual method. Dampen the inside and sprinkle baking soda all over the surfaces. Scrub with a sponge or old toothbrush, focusing on corners and seams. For crusty, dried-on stuff, let a thick paste of baking soda and water sit for 15 minutes before scrubbing. Baking soda is a mild abrasive—it lifts grime without scratching most plastics.

Then wipe everything down with a cloth dampened in vinegar (or a 50/50 vinegar-water spray). That neutralizes any baking soda residue and kills lingering smells. Rinse well with warm water and dry with a towel or leave it open to air dry. For truly stubborn odors like sour milk or fish, leave a small open bowl of baking soda inside overnight, then wipe out the next morning.

Don’t throw bleach or harsh spray cleaners at it—this takes five minutes and won’t leave chemical residue where your sandwich goes. Just don’t skip the rinse, or your lunch will taste vaguely like a salad dressing experiment.

Your future self will appreciate not biting into pickle-scented bread.