How to Wash Gym Clothes and Activewear Without Ruining Them
Updated: Sep 20
Quick answer: wash activewear inside out, in cold water, with about half the usual detergent and no fabric softener, then air-dry or tumble on low. Synthetic fibers repel water, so hot cycles and heavy detergent leave bacteria in the fabric; heat is what makes leggings lose their stretch. If gear already smells even when clean, soak it in one part white vinegar to four parts cold water for 30 minutes before washing. Green Clean follows these settings when you note them in the app, at $1.90 a pound. Updated September 2026.
Why gym clothes smell even after washing
Polyester, nylon and spandex are hydrophobic. That is the whole point of them during a workout: sweat gets pulled off your skin and pushed to the surface. In the wash, the same property means water doesn't fully penetrate the fiber, so the bacteria and odor compounds sitting in it don't fully rinse out.
Three habits make it worse. Washing hot sets the odor into the fiber instead of lifting it. Using too much detergent leaves residue that traps bacteria and blocks wicking. And leaving damp gear balled in a bag for hours gives bacteria a warm, wet head start before the wash even begins.
The method that works
Turn everything inside out. The sweat and bacteria are on the inside, against your skin. Put that surface in contact with the water.
Wash cold. Cold is more effective than hot on synthetics and won't damage spandex. Green Clean washes cold by default.
Halve the detergent. More soap is not cleaner. Residue is the main reason gear stops smelling fresh. Use about half the recommended dose.
Skip fabric softener entirely. It coats fibers with a waxy layer that kills moisture-wicking and locks in odor. Good for cotton towels, bad for gear.
Air-dry, or tumble low. Heat is the enemy of elastic. Hang or lay flat; if you must use a dryer, use the lowest setting and pull things while slightly damp.
What not to do
Don't leave sweaty clothes wet in a bag or hamper; even a few hours matters.
Don't dry on high heat; it is the single biggest reason leggings go loose.
Don't bleach synthetics; it breaks down both fiber and elastic.
Don't throw gym clothes into a hot cotton load because it was convenient.
The pieces that need extra care
Sports bras. The most elastic and the most wear. Hand wash in cold water when you can; in a machine, use a mesh bag so hooks and straps don't snag.
Compression gear. Leggings, compression socks, lined shorts. Cold wash, air-dry only. Heat is what makes compression fabric slack.
Merino base layers and running socks. Machine washable, contrary to what most people think, but cold, gentle and never in the dryer. Lay flat.
Waterproof and water-resistant shells. Washing actually refreshes the water-repellent coating, as long as you skip softeners and fragranced detergents and tumble on low.
If it already smells "clean but not"
Soak the gear in one part white vinegar to four parts cold water for 30 minutes, then wash as above. The vinegar breaks down the bacteria and odor compounds embedded in the synthetic fibers. One round usually fixes it; stubborn pieces may need two.
Green Clean at a glance (September 2026)
Wash and fold: $1.90 per pound, weighed dry at our facility. Full pricing.
Fees: none. No pickup or delivery fee. Orders are billed at a 10 lb minimum ($19).
First order: 20% off, applied automatically in the app.
Pickup windows: any 1-hour window between 7am and 7pm, seven days a week.
Turnaround: 7–8am pickups come back the same evening; every other window is next day.
Dry cleaning: priced per item (shirts from $4.50) through our partner cleaner, back 24–48 hours after wash & fold. Dry cleaning details.
Service area: all of Manhattan below 135th Street. See every neighborhood.
Where we are: 981 Columbus Ave, Upper West Side. Text (212) 280-5078 with any question.
Handing it off
If you work out most days you produce four to seven pounds of gym clothes a week. That is under the 10 lb minimum, so a gym-only bag is billed at $19; most people send it in with the rest of the week’s laundry and pay $1.90 a pound for the lot.
The settings above are how we already wash: cold water, sorted by color, no softener unless you ask for it. Put "activewear: inside out, low heat" in your standing order notes once and it applies to every pickup. Put anything you want air-dried, sports bras and compression gear especially, in its own small bag; we hang it at no extra charge. Cotton towels and everyday clothes can go in the same order and will be sorted at the facility.
Try it once, at 20% off
Download the Green Clean Laundromat app for iOS or Android, add your address and building notes, and pick a window. Leave the bag at your door or with your doorman; you don't need to be home. Your first order is 20% off, and there is nothing to cancel afterward because there is no subscription. Questions before you start? Text us at (212) 280-5078 or read how pickup works step by step.
Frequently asked questions
How do you get the smell out of gym clothes that won't go away?
Soak them in one part white vinegar to four parts cold water for 30 minutes, then wash cold, inside out, with about half the usual detergent and no fabric softener. The vinegar breaks down the bacteria and odor compounds embedded in synthetic fibers.
Can you put gym clothes in the dryer?
Air-drying is best. If you use a dryer, use the lowest heat and take the clothes out while slightly damp. High heat permanently degrades spandex and elastic, which is why leggings lose their shape.
How often should you wash gym clothes?
After every workout. Sweat is embedded in the fibers after one use, and letting it sit makes the odor harder to remove.
Why do my leggings keep losing their shape?
Almost always heat. High-heat dryer cycles break down the spandex that gives leggings their stretch. Switch to air-drying and the difference is noticeable within a few weeks.
Will a laundry service wash activewear correctly?
Green Clean washes cold, sorts by color and uses no softener unless asked. Add activewear instructions to your order notes in the app and put anything you want air-dried in a separate small bag; air-drying is free. Wash and fold is $1.90 per pound with no fees.
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