Sunlight is the real lunch box deodorizer

Sunlight is the real fix for stale food smells in plastic and silicone lunch boxes, but baking soda paste gets you there faster.

The reason soap and water isn’t enough is that food oils and residue get into microscopic pores in the plastic or silicone. The smell you catch is those oils going rancid. You need something that breaks them down, not just a rinse.

Coat the inside with a baking soda paste—about 3 parts baking soda to 1 part water—and let it sit overnight. Then rinse and wash normally. That pulls a lot of the odor out. The real killer, though, is direct sunlight. Set the box outside, lid off, for a few hours. UV light breaks down the leftover odor compounds that baking soda can’t reach.

If you don’t have sun, a white vinegar soak works too, but you have to rinse it very well and let it fully dry. Skip bleach and anything perfumed. Bleach leaves its own smell and can damage silicone, and scented cleaners just cover the stink with a worse one.

Dry it completely before storing. Standing moisture is how the moldy-smell cycle starts again.

Your lunch doesn’t need to taste like last Tuesday’s spaghetti.