A small sprinkle of salt inside any shoe, gym shoes, canvas sneakers, or heels, left overnight, soaks up lingering odor so shoes start the next day fresher.
Two Salt Tricks for Shoes and a Coffee Pot

Salt does more than flavor food: it draws moisture out of things, and its hard grains make a surprisingly good gentle abrasive.
Deodorize Smelly Shoes With Salt
Clean a Glass Coffee Pot With Salt and Ice
A diner-waitress favorite: a hefty dose of salt and a few ice cubes swirled vigorously around a coffee pot scours the bottom clean, with the ice helping agitate the salt for a better scrub before rinsing.
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