Most lunch box smells come from how you store it, not how you wash it.

Most lingering lunch box smells are a storage problem, not a washing problem. Dry the container completely with the lid off before you put it away.

Here’s what’s happening: soap gets the visible gunk off, but if you snap the lid on while the container is still damp and put it in the cupboard, that trapped moisture breeds bacteria and mold. That’s the smell. It’s not “the curry soaked in.” It’s the wet, sealed, dark environment you just created.

For containers that already stink, baking soda paste scrubbed in and left for a few minutes kills most odors. Vinegar soak works too — do a half-and-half vinegar water mix, let it sit for 15 minutes, then wash normally. And sunlight genuinely works: UV kills odor-causing bacteria, so a couple hours on a sunny windowsill does what the dishwasher can’t.

If you pack strong foods regularly — curry, fish, garlic-heavy stuff — the real fix is switching to glass or stainless steel. Plastic is porous and absorbs odors no matter how well you wash it. Use plastic for the boring sandwiches, glass for the stuff that fights back.

And if you eat curry every day, just switch to glass and be done with it.