Your lunch box needs a soak, not just a wipe.

Deep-cleaning a molded lunch box comes down to two things: getting into every crevice and making sure it’s bone dry before you close it.

The molded compartments are the problem. Crumbs and grease hide in those tight corners and seam lines, and a quick wipe with a sponge just pushes the gunk around. Use warm soapy water and a toothbrush or bottle brush to work into every groove. If your lunch box has a removable tray or gasket, take it apart first. That’s where the funk lives.

If it’s starting to smell, you need more than soap. Give it a soak in warm water with a splash of bleach, or white vinegar if you’d rather go that route. Ten minutes is plenty. Rinse thoroughly, then leave it open and upside down to dry completely. Odor is bacteria, and bacteria need moisture, so a fully dry lunch box is a huge part of the battle.

Dishwasher is tempting, but check the plastic first. Many lunch boxes aren’t dishwasher safe, and the high heat can warp the shape and ruin the seal. Hand washing with a soak is honestly faster and safer.

Future you will appreciate a lunch box that doesn’t smell like last Tuesday’s yogurt.