Fungal spores can survive inside shoes for six months or longer, which is why treating your feet alone often isn’t enough to get rid of athlete’s foot or toenail fungus for good. Your shoes become a reservoir for reinfection every time you slip them on. Eliminating fungus from footwear requires a combination of disinfection, moisture control, and smarter wearing habits.
Why Shoes Harbor Fungus So Effectively
The inside of a shoe is essentially an incubator. Your feet produce sweat throughout the day, and the enclosed, warm, dark environment never fully dries out between wears. Dermatophytes, the fungi responsible for athlete’s foot and toenail infections, thrive in exactly these conditions. They embed in the insole material, lining fabric, and stitching, then transfer back to your skin the next time you wear the shoes.
This is the main reason foot fungus keeps coming back after treatment. You clear the infection on your skin, put on the same contaminated pair of sneakers, and the cycle restarts. Any serious effort to get rid of foot fungus has to include the shoes themselves.
Antifungal Sprays and Powders
The most accessible option is an over-the-counter antifungal spray or powder designed for footwear. Sprays are applied directly to the shoe interior and work by killing fungal organisms on contact. Powders serve a dual purpose: they contain antifungal agents and absorb moisture, making the shoe less hospitable to new fungal growth. For active infections, use the spray to treat contaminated shoes. Once the infection clears, switching to a powder for daily maintenance helps prevent reinfection.
Apply the product to the full interior of the shoe, including the toe box and along the sides, not just the insole. Let the shoe dry completely before wearing it. Doing this daily during an active infection and a few times a week afterward gives you the best results.
UV-C Light Devices
Ultraviolet-C shoe sanitizers are small devices you insert into your shoes to kill microorganisms with short-wavelength UV light. These work quickly. Studies on UV-C decontamination devices have shown significant pathogen reduction with exposure times as short as 8 seconds, though most consumer models run for 15 to 45 minutes per shoe to ensure thorough coverage of all interior surfaces. UV-C is a good option for shoes you can’t wash or spray, like dress shoes or boots with delicate linings. The devices typically cost between $30 and $100 and are reusable indefinitely.
Ozone Treatment
Ozone gas is a powerful disinfectant that reaches every crevice inside a shoe, including areas sprays and UV light may miss. Research on footwear from patients with toenail fungus infections found that ozone gas effectively sanitized contaminated shoes, killing the specific dermatophyte species (Trichophyton rubrum and Trichophyton mentagrophytes) responsible for most foot fungus. Some consumer ozone shoe sanitizers are available, and the technology is also used in bowling alleys and sports facilities. If you’re dealing with stubborn, recurring toenail fungus, ozone treatment of your shoes alongside medical treatment can reduce the risk of reinfection.
Washing Machine-Safe Shoes
For canvas sneakers, athletic shoes, and other machine-washable footwear, laundering is one of the most effective decontamination methods. Temperature matters, though. A study on socks from patients infected with Trichophyton rubrum found that washing at 60°C (140°F) eliminated the fungus completely, while washing at 40°C (104°F) left a small number of samples still positive. If your machine doesn’t reach 60°C, washing twice on a long cycle of at least 14 minutes with detergent can also achieve decontamination, even in cold water. The mechanical agitation of the wash itself plays a significant role in physically removing fungal material from fabric.
Remove insoles before washing and launder them separately. Air dry shoes completely afterward, ideally in direct sunlight. Never put damp shoes back on.
Leather and Non-Washable Shoes
Leather, suede, and other non-washable materials require gentler approaches. You can’t toss them in the washing machine without ruining them, but you still have options. UV-C devices and ozone sanitizers both work well here since they don’t involve moisture or harsh chemicals. Antifungal sprays formulated for shoes are also generally safe on leather interiors, but test a small hidden area first.
One interesting approach tested in athletic training research used a malleable putty compound containing an antifungal agent. The putty was pressed firmly into the shoe interior for about 10 seconds, repeated two or three times to cover the entire surface. It physically picked up debris while depositing an antifungal on contact surfaces. While this specific product may not be widely available everywhere, the concept highlights that physical cleaning combined with antifungal treatment is more effective than either alone.
What About Vinegar and Home Remedies?
Vinegar is commonly recommended online, but the evidence is mixed. Standard household vinegar (about 4% acetic acid) showed the ability to inhibit the growth of certain mold species in laboratory testing but had no effect on others. No rigorous studies have tested vinegar specifically against dermatophytes inside shoes, and the fungi that cause athlete’s foot are particularly resilient organisms. If you want to try it, wiping down shoe interiors with undiluted white vinegar and letting them dry completely is unlikely to cause harm, but it shouldn’t be your only strategy. Pair it with a proven method like an antifungal spray or UV-C device.
Rubbing alcohol (70% ethanol) performed even worse in the same laboratory evaluation, showing no inhibitory effect on the fungi tested. Baking soda may help absorb moisture but has no demonstrated antifungal activity.
Rotate Your Shoes to Starve the Fungus
One of the simplest and most overlooked strategies is shoe rotation. Giving a pair of shoes 24 to 48 hours of rest between wears allows the interior to fully air out and dry. Fungi need moisture to grow and reproduce, so consistently dry shoes are far less likely to harbor active colonies. If you only own one pair of everyday shoes, this is a good reason to get a second pair.
During the rest period, pull the tongue open, remove the insoles, and place the shoes in a well-ventilated area. Stuffing them with newspaper or cedar shoe trees accelerates moisture absorption. Avoid storing shoes in gym bags, lockers, or other closed spaces where air circulation is limited.
A Practical Decontamination Routine
If you’re actively treating a foot fungus infection, here’s a straightforward approach that covers your bases:
- Daily during treatment: Spray the interior of every pair of shoes you’re wearing with an antifungal shoe spray. Let them dry before putting them on.
- Rotate at least two pairs: Never wear the same shoes two days in a row. Give each pair a full day to dry out.
- Wash what you can: Machine-wash canvas and athletic shoes at 60°C, or run two long cold-water cycles with detergent.
- Treat what you can’t wash: Use a UV-C sanitizer or ozone device for leather, dress shoes, and boots.
- Replace insoles: If your insoles are worn, replacing them is often easier and more effective than trying to decontaminate them. Removable insoles are cheap and eliminate a major fungal hiding spot.
- After the infection clears: Switch to an antifungal powder a few times a week to keep moisture levels low and maintain a hostile environment for any remaining spores.
Given that fungal spores can persist in shoes for six months or more, continuing some level of shoe hygiene well after your skin or nails look healthy is what separates people who beat foot fungus from those who keep fighting the same infection year after year.