You washed them. They're clean. They're dry. You pull them on and, five minutes into your warmup, there it is. The ghost of last Tuesday's workout.

Quick answer: synthetic fabrics hold onto body oils, and bacteria feed on them. Pre-soak, wash cold with an enzyme formula, skip fabric softener and air-dry fast.

Why gym clothes keep smelling

Polyester and nylon are great at wicking sweat. They're also great at grabbing body oils. Those oils build up wash after wash, and bacteria move in.^†

Your leggings are basically a tiny apartment complex.

Step 1: Don't let them marinate

A sweaty bag in a hot car is where smells are born. Hang clothes to dry before they hit the hamper, or wash them the same day.

Step 2: Pre-soak

Soak in cool water with a dissolved sheet for 30 minutes. It loosens the oil buildup before the main wash.

Step 3: Wash cold, inside out

• Turn clothes inside out so the sweaty side gets the most cleaning.
• Use cold water. Heat can damage stretchy fabrics.
• Use Just 9 for heavy odor. Its enzymes help break down what sweat leaves behind.

Step 4: Skip fabric softener

Softener can coat fibers and trap odor in. It also makes wicking fabric worse at wicking. Double loss.

Step 5: Dry fast

Air-dry or tumble dry low. Don't leave a damp load sitting in the drum.

Still smelly?

FAQ

Why do my workout clothes smell after washing? Body oil builds up in synthetic fibers and bacteria feed on it. A pre-soak and enzymes help.

Should I wash gym clothes in hot water? Usually cold. Heat can damage stretch fabrics. Check the label.

Does vinegar help gym clothes? Some people use it in the rinse. Check your washer's manual first.

Which Just sheet for gym clothes? Just 9.