After you are done wearing stinky tennis shoes, put a sachet of baking soda inside the shoes to help absorb odors until you're ready to wear them again. Wrap some baking soda up in a small piece of cloth and tie it up with ribbon or string. You'll have your own homemade sachet to use in your shoes.
Fill the toe of a sock with baking soda and tie it off. Leave this Sock Sachet in your shoes overnight to absorb odors.
Baking Soda Option #2
Sprinkle a layer of baking soda directly into your shoes to sit overnight. In the morning tap the baking soda out before wearing. Be careful about using baking soda in leather and suede shoes. A buildup of baking soda can cause shoes to become more brittle. Use the sachets described above in shoes you may have concerns about.
Benefits of Baking Soda and Shoe Odors
Using baking soda to remove shoe odors can reduce sensitive skin reactions with other odor removal products. It will also remove odors without adding other fragrances that linger and mingle with your shoes.