Things You Will Need
Both types can be washed by hand. Clean your metal lunchbox after every use, and pay particular attention to the corners and crevices where crumbs tend to get stuck.
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Wet your sponge with warm water and squeeze a bit of dish soap on the sponge.
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Scrub the inside and outside of your metal lunchbox with the soapy sponge.
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Rinse the lunchbox with warm water.
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Wet one end of a cotton swab with warm water.
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Clean the corners and crevices with the cotton swab. You might need to use multiple cotton swabs to reach all of the crevices.
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Rinse your lunchbox and leave it open to air dry.