Below are 5 simple and easy ways to deodorize smelly shoes without using any harsh chemicals.

1. BAKING SODA
Baking soda is an all around product that has multiple uses. It is a natural deodorizer so it will help to neutralize odor from shoes. Sprinkle a little bit of baking soda in your shoes. Leave it to absorb the smell for a few hours. Remove the baking soda from the shoes before putting them on.
2. VINEGAR
White vinegar can be used to remove odour from shoes. Mix about 2 cups of vinegar in 8 liters of water. Soak sohes and insoles in a vinegar solution for an hour. Then let them dry in sun. If your shoes are non-washable, just soak a dry cloth in white vinegar and then clean the shoes.
3. ESSENTIAL OILS
Essential oils are effective natural deodorizers. Soak a cotton ball a little peppermint oil or any other essential oil and place them in your shoes for few hours. This will eliminate odor and add a fresh scent in your shoes.
4. FREEZE THEM
Place the shoes into a plastic grocery bag or use a large resealable bag. Place the bag in the freezer. Leave in there between 12 to 24 hours. Remove the shoes. They will be odor free. The temperature and lack of humidity will eliminate the odor-causing bacteria.
5. DRYER SHEETS
When the shoes are not in use, place a dryer sheet in each one. Leave them for few hours. The dryer sheet will help neutralize shoe odors and make them smell fresh.
Source: interesting-facts
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