Odor causing bacteria cannot grow in your shoes without moisture. One way to reduce moisture in your shoes is to sprinkle them with salt. Salt actually pulls water from bacteria cells and weakens their molecular structure. Reduce bacteria-causing moisture by sprinkling your shoes with kosher salt or sea salt; do not use regular table salt as the finer grains may be difficult to remove from your shoes.*
After wearing your shoes, spread 2 tablespoons of coarse-grain salt over the insoles. Let your shoes dry completely and sit for 12-24 hours before tapping the salt out.
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Photo | Dubravko Sorić | Salt_B130604 | Photo used under a Creative Commons Attribution License