How to Wash Polyester (And Keep It Odor-Free)
Updated July 2026
The short answer
Polyester is the most durable fabric in your laundry — it doesn't shrink in normal washing, barely wrinkles, and survives abuse that destroys cotton. It has exactly two enemies: high heat, which can warp, glaze, or permanently wrinkle the plastic fibers, and residue coatings, which trap the body oils that make synthetics smell. The routine writes itself: cool or warm washes, inside out, normal detergent, no fabric softener, and low or no dryer heat. The odor problem is polyester's one real weakness — the fiber holds body oil that ordinary washing leaves behind. That's a residue-and-bacteria issue with its own fix, covered in the workout-clothes guide.
Before you start
Check the blend: pure polyester follows this guide directly; poly-cotton blends inherit cotton's shrink risk in the dryer; anything with elastane inherits the no-high-heat rule twice over.
Wash polyester inside out — it pills by surface friction, and pilling is polyester's main cosmetic aging.
Skip fabric softener permanently on synthetics: it coats the fiber, locks in oils, and starts the smell cycle.
Treat stains before washing — oily stains especially, since polyester attracts and holds oils (the same affinity that causes the odor issue makes grease stains cling).
Steps
- 1Turn garments inside out and close zippers in the load — zipper teeth are polyester's pilling accelerant.
- 2Wash cool to warm on a normal or permanent-press cycle. Permanent press exists nearly for this fabric: its cool-down prevents the heat-set wrinkles polyester is prone to.
- 3Normal detergent, correctly dosed, no softener.
- 4Pre-treat oily stains with dish soap before the wash — polyester grips oil harder than cotton does.
- 5Dry low or hang dry. Polyester air-dries fast, and every degree of dryer heat you skip extends the garment's life and shape.
- 6Pull it out promptly — polyester left hot and crumpled in a drum sets those wrinkles semi-permanently, and unlike cotton, ironing them out later is risky.
- 7Iron only on the synthetic (lowest) setting with a pressing cloth , if ever. Melted polyester glazing is permanent.
What not to do
- Do not use hot dryer settings — heat is the one thing that genuinely damages polyester, warping fibers and setting wrinkles and smells alike.
- Do not use fabric softener or dryer sheets on synthetics; the coating starts the permastink cycle.
- Do not iron hot. Polyester melts before cotton settings finish warming up.
- Do not wash badly-smelling synthetics hotter as a fix — the fix is stripping the residue, not cooking the fiber.
- Do not tumble polyester with heavy zippered items; that's where the pilling comes from.
Frequently asked questions
Does polyester shrink in the wash or dryer?
Not in any normal wash — polyester is dimensionally stable plastic. Very high dryer or iron heat can warp or slightly contract it, but that's heat damage rather than cotton-style shrinking, and it's usually accompanied by texture change. Keep heat low and polyester keeps its size for years.
Why does my polyester shirt still smell after washing?
Polyester's fibers hold body oils that ordinary washing leaves behind, and bacteria in that oil reactivate with body heat. The fix is stripping — oxygen bleach or vinegar soaks plus enzyme detergent — and permanently skipping fabric softener, which seals the oils in. The workout-clothes guide covers the full protocol.
Can you iron polyester?
Carefully, at the lowest synthetic setting, ideally through a pressing cloth — polyester melts and glazes at temperatures cotton shrugs off, and glazing is permanent. Usually you don't need to: a permanent-press wash cycle and prompt removal from the dryer prevent the wrinkles in the first place.
Why does polyester pill, and can I prevent it?
Pilling is surface fibers breaking and balling under friction — polyester's strength means the pills cling instead of shedding. Slow it down: wash inside out, close zippers in the load, use gentler cycles, and skip crowded drums. A fabric shaver removes the pills that form anyway.
Polyester gear that smells the moment you sweat? That's the synthetic-odor cycle — use the Stain Rescue Tool or the workout-clothes guide.
Use the Stain Rescue Tool