How to Care for Polyester and Blends

October 12, 2026

Most polyester can be machine washed and dried. Wash polyester in cold water, up to 30°C (86°F), inside out, in a full load. Hang it to dry, or tumble it on low and take it out as soon as the cycle ends. Iron it at two dots, the medium setting, or at one dot if it contains stretch. For a blend, follow the label; without one, care for its most delicate fiber.

Polyester is heat-set at the mill, which fixes its size, and it repels water. What it needs is care with heat, oil and odor: it holds on to oily stains and body odor, and a hot iron comes close to its melting point. The sewn-in label on each piece comes first: its instructions mark the harshest treatment the piece can take, so a cooler wash or a gentler cycle stays within them. Sizes and fit are on Size & care.

Step	What to do	Why
Wash	Cold, up to 30°C (86°F); warm, up to 40°C (104°F), for heavy soil, if the label allows. Inside out, in a full but not packed load.	Cold water fades synthetics less and keeps their fit.
Detergent	The measured dose. Enzyme or oxygen-bleach products for odor. No softener on moisture-wicking fabrics.	Excess detergent leaves residue that traps odor.
Dry	On a hanger, or tumble on low and remove promptly.	Fiber makers advise low heat and prompt removal.
Iron	Two dots, medium; one dot, low, for stretch blends. Pressing cloth, light pressure.	The cotton setting comes close to its melting point.
Bleach	Oxygen bleach only, if the label allows. Never chlorine on anything with spandex or elastane.	Chlorine damages stretch fibers.

What temperature should you wash polyester at?

Wash polyester cold, up to 30°C (86°F), for everyday wear; warm, up to 40°C (104°F), for heavy soil or an oily stain, if the label allows. On a US care label, the Federal Trade Commission defines "cold" as water up to 30°C (86°F) and "warm" as 31–44°C (87–111°F). Consumer Reports advises cold water for synthetics because it helps prevent fading and keeps their fit, and notes that hot water can damage the fibers that make clothes stretchy.

Warmer water helps in two cases. Within the label's limit, it lifts heavy soil and oily stains. For hygiene, a 2025 study of laundry odor notes that reducing bacteria takes water at 60°C (140°F) or more, an oxidizing bleach, or both. The international care classes that name polyester stop at 40°C (104°F), so oxygen bleach, where the label allows it, is the route for polyester.

Does polyester shrink?

Usually very little, if it is all polyester. The fabric is heat-set during finishing at around 170–220°C (340–430°F), far hotter than a home wash or dryer reaches, and that fixes its dimensions. A small change is still possible: one heat-setting patent treats shrinkage under 6% after washing as acceptable. Blends are a different matter: the cotton or viscose in them can shrink, and fiber makers and Consumer Reports warn that heat harms spandex.

Can polyester go in the dryer?

Yes, on low. The fiber makers' advice is to dry polyester at a low temperature and take it out as soon as the cycle ends. The likely reason is heat. Polyester begins to soften at around 70–80°C (160–180°F), its glass transition, and an international label's two-dot "normal" tumble setting allows exhaust air up to 80°C (176°F), so creases pressed into a warm load can set as it cools; the one-dot setting stops at 60°C (140°F). For stretch blends, the fiber makers advise drip-drying, or the lowest heat.

In a humid climate, dry polyester quickly. In a 2025 study, worn and washed synthetic T-shirts dried in humid air, at 31.8°C (89°F) and 80% humidity, smelled markedly worse than shirts dried at 24.5°C (76°F) and 50% humidity.

Why does polyester smell even after washing?

Polyester repels water and holds on to oil, and body odor clings to it. In a 2014 study, polyester shirts worn for an hour's exercise smelled significantly stronger and less pleasant than cotton ones. Another study found odor on polyester stayed most intense even after washing, because the odor-causing acids from skin washed out of it less well than out of cotton and may build up over repeated wears. The full reason is still being studied. What helps:

Wash it soon. A damp, bunched-up piece is where odor sets in, the American Cleaning Institute notes.
Pretreat or soak it in an enzyme product, or wash it with oxygen bleach where the label allows.
Measure the detergent. A Consumer Reports chemist notes that excess detergent leaves residue that traps odor.
Skip fabric softener on anything sold as moisture-wicking. Consumer Reports notes it can clog the fabric and reduce wicking.
Dry it fast, in dry air.

Vinegar is often suggested, but no controlled study we found shows it removes body odor from polyester.

How do you get oil stains out of polyester?

Treat an oil stain before washing: according to a detergent maker's patent, ordinary laundering often leaves oily soil behind in polyester. Work liquid laundry detergent or dish soap into the stain, then wash in the warmest water the label allows. For a heavy stain, the American Cleaning Institute's method is to lay it face down on paper towels and apply a cleaning fluid to the back, changing the towels as they absorb it; if the label crosses out the circle, skip the cleaning fluid, since the international care system rules out solvent stain removers with that symbol. Keep the piece out of the dryer until the stain is gone, because heat can set it.

How do you stop polyester from pilling?

Turn pieces inside out, wash them on shorter cycles in full loads, and keep them away from rough fabrics and open zips. Pills last on polyester because its fibers are strong: when they rub loose, they stay anchored to the fabric as small balls instead of falling away. Blends pill for the same reason, as the weaker fiber wears and breaks and the polyester holds the pill in place. A fabric shaver removes pills; use it lightly and rarely, because it removes fiber too.

How do you iron polyester?

Iron polyester at the medium setting, two dots in the iron symbol, up to 150°C (300°F). Use the low setting, one dot, up to 110°C (230°F), for stretch blends and for anything shiny. Iron through a pressing cloth or on the reverse, with light pressure, and keep the iron moving. Polyester melts at about 250°C (480°F) and spandex at about 230°C (450°F). The cotton setting, three dots, allows up to 200°C (390°F), which leaves little margin, so keep to the label's dots. A steamer is often the easier tool.

How do you wash a polyester blend?

Follow the label, which must be safe for the whole piece, linings and trim included. Without one, our guidance is that the gentler fiber decides.

Blend	Care
Polyester-cotton	Cold, or warm if the label allows; tumble low; medium iron. It holds oily stains like polyester, so pretreat them.
Polyester-viscose	Care for the viscose: cold and gentle, never wrung, dried flat or on a hanger, no dryer. See How to Care for Viscose.
Polyester-linen	Wash for the linen: gentle cycle, half-full drum, dried on a hanger. Iron for the polyester: two dots, not linen's three. See How to Care for Linen.
Polyester with spandex or elastane	Cold water, no chlorine bleach, no high heat; drip-dry or tumble on the lowest setting; one-dot iron, quickly.
Recycled polyester	Care for it as polyester; it is the same polymer.

How do you reduce the microfibers polyester sheds?

Shorter, cooler cycles, fuller loads, less water and a filter all cut shedding in tests.

Shorter, cooler cycles. In one trial with real household laundry, a 15°C (59°F) wash of 30 minutes released 30% less fiber than a 40°C (104°F) wash of 85 minutes; another lab found temperature and time made no difference on their own.
Full loads. Loads of 3.5–6 kg (8–13 lb) shed about half as much per kilogram as loads of 1–3.5 kg.
Less water. A high-efficiency top-loader, filling about 30 liters against a traditional machine's 64, released 37–70% less. In a 2019 study, the delicate cycle's extra water released about 800,000 more fibers than a standard cycle in the first wash, and more in later washes too, so skip it unless the label or a viscose blend calls for it.
A filter. In one test of six devices, a washing bag made for the purpose cut release by about 54% and the best external filter by about 78%; the weakest managed 21%.

New clothes shed most in their first few washes, so the first washes are where these measures count most.

How do you store polyester?

Clean and dry. Odor builds up in polyester put away worn, and damp, bunched synthetics breed bacteria.
Wovens on wide, padded hangers, never thin wire ones; knits and bias-cut pieces folded; trousers and skirts hung from the waist.
In breathable covers, not plastic.

Dresses, blouses, trousers and blazers

Dresses. A lined dress may pair a polyester shell with a lining of another fiber. The label covers both; follow it.
Blouses. Wash a polyester blouse soon after a warm day, before odor sets, and hang it straight from the machine so creases do not set.
Trousers. Press the crease with a two-dot iron through a damp cloth.
Blazers. Follow the label, which reflects the blazer's most sensitive part, such as the interfacing, lining or trim. Respect "Dry clean only": under US rules it may be printed only with evidence that washing would damage the piece.