Athlete’s foot fungus can survive inside your shoes for months, even years, hiding in dead skin flakes and moisture trapped in the lining. Treating your feet without treating your shoes is one of the most common reasons the infection keeps coming back. Here’s how to actually eliminate it from your footwear.
Why Your Shoes Keep Reinfecting You
The fungi that cause athlete’s foot (dermatophytes) shed from your skin as tiny spores embedded in dead skin cells. Those spores settle into the warm, dark interior of your shoes and can remain viable for months to years. Every time you slip your feet back in, you’re walking right back into the infection. This is why people who treat their skin but ignore their shoes often find the itching and peeling returning within weeks.
Antifungal Sprays and Powders
The most straightforward option is an over-the-counter antifungal shoe spray or powder. Look for products containing undecylenic acid (commonly at 10% concentration), tolnaftate, or miconazole as the active ingredient. These are the same antifungal compounds used to treat the infection on skin, reformulated to penetrate shoe materials.
To use them effectively, remove the insoles first and spray or dust both the insoles and the inside of the shoe thoroughly. Pay extra attention to the toe box, where moisture and skin debris accumulate most. Let the shoes dry completely before wearing them again. Repeat this after every wear during an active infection and for at least a few weeks after your skin clears up.
UV Shoe Sanitizers
UV-C shoe sanitizer devices are marketed as a high-tech solution, and they do reduce fungal contamination, but the results are more modest than you might expect. A study published in the Journal of the American Podiatric Medical Association found that a UV shoe sanitizer achieved about a 76% reduction in the most common athlete’s foot fungus after a 45-minute treatment cycle. Running additional cycles didn’t improve the results.
That means UV sanitizers can help as part of a broader routine, but they won’t sterilize your shoes on their own. If you use one, pair it with an antifungal spray for better coverage.
Washing Machine-Safe Shoes
If your shoes can handle a wash cycle (canvas sneakers, certain athletic shoes), this is one of the most effective methods. Use warm water with a mild detergent. Avoid bleach or harsh chemicals, which can break down shoe materials without necessarily killing spores better than detergent and heat. Remove the insoles and laces and wash them separately.
The key step after washing is thorough drying. Fungus thrives in moisture, so stuff the shoes with newspaper or use a shoe dryer to pull out every bit of dampness before you wear them again. A damp shoe fresh from the wash is still a hospitable environment for any surviving spores.
What About Vinegar and Baking Soda?
These are popular suggestions online, but the evidence behind them is thin. Baking soda may slow fungal growth on surfaces, though researchers aren’t sure exactly how, and slowing growth is not the same as killing established spores. Apple cider vinegar has some general disinfectant properties, but its effect on athlete’s foot fungus specifically hasn’t been studied. The acetic acid in vinegar can also damage certain shoe materials, and at high concentrations it can cause chemical burns on skin.
If you’re dealing with an active infection, antifungal sprays with proven ingredients are a more reliable choice than kitchen remedies.
Leather, Suede, and Delicate Materials
Leather and suede shoes can’t go in the washing machine, and harsh chemicals will stain or crack them. For these, stick to a two-step approach: wipe the interior with a cloth dampened with mild soapy water, then follow up with an antifungal spray once the shoe is fully dry. Some antifungal powders work well here too, since they absorb moisture while treating the fungus.
For expensive dress shoes or boots you want to protect, consider replacing the insoles entirely. Insoles absorb the most sweat and harbor the densest concentration of fungal spores. A fresh pair of insoles combined with an antifungal spray on the shoe interior is often the most practical solution for footwear you can’t aggressively clean.
Preventing Reinfection Long Term
Cleaning your shoes once won’t solve the problem if your daily habits keep creating the perfect fungal environment. The single most effective prevention strategy is shoe rotation. Don’t wear the same pair two days in a row. Give each pair at least 24 hours to dry out completely between wears. Fungus needs moisture to grow, and a fully dried shoe is a hostile environment for it.
Beyond rotation, a few habits make a real difference:
- Moisture-wicking socks: Synthetic athletic socks or merino wool pull sweat away from your skin far better than cotton, which holds moisture against your feet.
- Antifungal powder before wearing: A light dusting inside your shoes before each wear keeps moisture down and creates an inhospitable surface for spores.
- Treat your feet and shoes simultaneously: If you’re using an antifungal cream on your skin, spray your shoes at the same time. Treating one without the other is the main reason athlete’s foot keeps cycling back.
- Store shoes in ventilated spaces: Avoid leaving shoes in gym bags, closed lockers, or plastic bins where humidity builds up. Open air and airflow help them dry faster.
If you’ve had repeated infections, consider doing a full shoe treatment (spray, dry, replace insoles) on every pair you own at the start of your skin treatment. Spores can lurk in shoes you haven’t worn in weeks, and one overlooked pair can restart the cycle.