Washing underwear in hot water, at least 60°C (140°F), is the most reliable way to eliminate yeast from fabric after an infection. Standard warm or cold wash cycles leave Candida albicans, the fungus behind most yeast infections, largely intact. Getting the laundering right matters because reinfection from contaminated underwear is a real, if underappreciated, possibility.
Why Regular Washing Isn’t Enough
Candida albicans is surprisingly resilient in laundry. A study testing contaminated cotton swatches in household washing machines at temperatures between 20°C and 60°C found that Candida was “virtually unaffected” by activated oxygen bleach (the type found in many color-safe detergents), even when other bacteria were killed effectively. At lower temperatures, detergent alone does very little to eliminate the fungus. This means your normal wash cycle, especially if you wash on cold or warm to protect fabrics, is likely leaving yeast cells behind.
The texture of underwear fabric plays a role too. Cotton and synthetic blends can trap fungal cells in their fibers, and a quick or gentle cycle may not generate enough mechanical action to physically remove them even if it can’t kill them outright.
The Right Water Temperature
A wash temperature of 60°C (140°F) is the threshold that consistently removes Candida from contaminated fabric in lab testing. Most washing machines label this as the “hot” setting, though it’s worth checking your machine’s manual, because some energy-efficient models cap their hot water below this point.
If your machine doesn’t reach 60°C, or if the underwear fabric can’t tolerate that heat, you have a few alternatives. Soaking the underwear in water heated to at least 60°C for 10 to 15 minutes before a regular wash cycle can help bridge the gap. Adding chlorine bleach (the plain, unscented kind) to a wash load is another option for white cotton underwear, since chlorine bleach is effective against fungi at lower temperatures. Color-safe or oxygen-based bleach, however, does not reliably kill Candida.
Why the Dryer Alone Won’t Do It
It’s tempting to assume a hot dryer cycle will finish the job, but research suggests otherwise. A 2022 study testing both home and laundromat dryers found that heat drying failed to kill fungal organisms on fabric. Every sample that went through a standard dryer cycle still tested positive for fungal growth within a week. The likely explanation is that residential dryers don’t sustain a high enough temperature for a long enough period to destroy the organisms. Direct heat exposure at 60°C for up to 90 minutes was also tested and still couldn’t fully eliminate fungal spores.
This doesn’t mean you should skip the dryer. Drying underwear completely is still important because Candida thrives in moist environments. A damp pair of underwear sitting in a laundry basket is an ideal breeding ground. The point is that drying alone is not a substitute for a proper hot wash.
Step-by-Step Washing Method
During and after a yeast infection, treat your underwear with a slightly more deliberate routine:
- Separate your underwear from the rest of your laundry. Washing it in its own small load (or with towels and sheets you also want sanitized) prevents cross-contamination and lets you use a hotter setting without worrying about delicate items.
- Wash at 60°C (140°F) or higher. Use your machine’s hot water setting. A longer cycle is better than a quick wash, since extended agitation helps physically dislodge fungal cells from fabric.
- Use a standard detergent plus chlorine bleach for white cotton underwear. For colored or synthetic underwear that can’t handle bleach, the hot water temperature is doing most of the work.
- Dry completely. Use a dryer on the hottest setting the fabric allows, or hang in direct sunlight. UV light from the sun has mild antifungal properties and ensures the fabric is bone dry before you put it away.
Choosing the Right Underwear Fabric
Cotton underwear is standard advice during a yeast infection because it breathes better than synthetics, reducing the warm, moist conditions that help Candida grow. Cotton also tolerates hot wash temperatures and bleach far better than nylon or spandex blends. If you wear synthetic underwear regularly, it’s worth switching to plain cotton during treatment and for a few weeks after symptoms resolve.
Thongs and very tight-fitting styles can also increase friction and trap moisture in the vulvar area, creating conditions that favor yeast overgrowth. Looser-fitting cotton briefs, while not glamorous, are the most practical choice while you’re clearing an infection.
How Long to Keep Up the Routine
Continue washing underwear on the hot cycle throughout your treatment and for at least a week after symptoms are completely gone. Yeast infections can linger at a low level even after you feel better, and reintroducing contaminated fabric against your skin during that window can restart the cycle.
If you’re dealing with recurrent yeast infections (four or more per year), it’s worth adopting the hot wash as your permanent default for underwear. Some people also replace underwear worn frequently during repeated infections, since older fabric with stretched or pilled fibers can harbor organisms more stubbornly than new garments. This isn’t strictly necessary if you’re washing at the right temperature, but it’s a low-cost precaution for anyone frustrated by infections that keep coming back.
Other Items Worth Washing
Underwear gets the most attention, but other items that contact the vulvar or groin area deserve the same treatment. Washcloths, bath towels (especially if you reuse them between washes), pajama bottoms, leggings, and swimwear should all go through a hot wash cycle during and after an infection. Bed sheets are worth doing at least once during treatment, since you spend hours in contact with them nightly. If you use reusable menstrual pads or period underwear, those need the same 60°C wash.