Baking soda and sun will fix your smelly lunch box

Baking soda and a little sunlight are the two things that actually kill smells in plastic lunch boxes — plain dish soap won’t do it.

The reason fish and curry linger is that plastic is slightly porous. The smell molecules get down into those tiny pores, and soap just washes the surface. It never touches what’s inside.

Here’s the fix. Make a thick paste of baking soda and water, spread it all over the inside of the box, and let it sit for a few hours or overnight. Rinse it out and the smell should be gone. If you’ve got a sunny windowsill, leave the box in direct sun afterward — UV light genuinely neutralizes odor-causing bacteria.

White vinegar works too, but it leaves a smell of its own that takes a while to fade. And whatever you do, don’t pour boiling water in there to “clean” it. That can warp the plastic and actually drive the smell deeper in.

If it still stinks after a paste and sun treatment, the smell has permanently bonded with the plastic. That box is done — get a glass one.