Put Workout Clothes Straight in Washer? Stop Now, Experts Warn

Failing to air out workout clothes before washing leaves odors even after laundering. Experts warn that putting sweaty gear directly into the washing machine—a habit many consider hygienic—may backfire.

Rebecca Jakeman, principal researcher at British consumer group Which?, told the Daily Mail recently that "if you don't give sweat space to evaporate, bacteria and odors remain trapped in the fabric and can persist after washing."

Performance fabrics used in athletic wear absorb sebum along with sweat deep into the fibers. When piled in a laundry basket while still damp, bacteria multiply rapidly. Once odor molecules embed in the fabric, regular washing cannot fully remove them. Clothes may smell fine immediately after laundering but turn foul again the moment they are worn.

Experts recommend the following laundry practices:

Before washing, hang clothes in a well-ventilated area to let sweat evaporate first. Turn garments inside out so the heavily soiled interior contacts water and detergent directly, improving bacteria removal.

Cut detergent use to half the usual amount. Excess detergent leaves residue that traps bacteria in the fabric. For stubborn odors, soak clothes briefly in diluted white vinegar before washing.

Skip fabric softener. It coats the micro-structure of performance fibers, reducing moisture-wicking and breathability. Most athletic wear care labels prohibit softener use.

Wash at 30°C or below; 20°C often suffices. Select the synthetic or sportswear cycle. High temperatures degrade performance fabric functionality.

Avoid tumble dryers. Spandex in leggings and cycling shorts loses elasticity from dryer heat, compromising fit and function. Air drying extends fabric life.

Separate by material. Washing synthetic athletic wear with heavy items like jeans causes friction damage and pilling.