How to Wash Polyester Clothes Without Ruining Them

To wash polyester clothes, use the washing machine on a gentle or permanent press cycle with cold or warm water, a small measured amount of detergent, and a low-heat or air dry. Polyester is tough, so most damage comes from heat and too much soap, not from the machine. Below you will find the full routine, the answer on shrinking, and fixes for stains and smells that will not leave.

TL;DR

• Machine wash on a gentle or permanent press cycle in cold or warm water. Whirlpool’s polyester guide recommends this, and says high heat can damage the fibers.

• Polyester rarely shrinks in cold or warm water. Hot washers and hot dryers are what cause trouble, so keep both on low.

• Turn garments inside out and measure your detergent. Too much soap leaves residue that traps dirt and odor.

• Treat oily stains with liquid detergent before washing, and never with hot water, which can set them.

• Blends, wool-blend coats and anything with trim need a closer look at the care label first.

Table of Contents

• Read the care label before anything else
• Step by step: washing polyester in a machine
• What water temperature works for polyester
• Does polyester shrink?
• Detergent: use less than you think
• Stains and smells on polyester
• Drying polyester and getting wrinkles out
• Washing polyester blends, coats and shoes
• Polyester and microfiber shedding
• Our view on caring for polyester
• Shop easy-care polyester pieces
• FAQ
• Sources

Read the care label before anything else

The small tag sewn into the side seam or collar overrules every general rule in this article. Polyester is a man-made fiber, and it is often blended with cotton, spandex, rayon or wool. The blend decides the routine. A 100% polyester dress and a 65/35 polyester-cotton shirt can tolerate similar washing, but a polyester-wool coat cannot.

Here is how to read what you find:

If a garment has no label, treat it as the most delicate fiber it might contain: cold water, gentle cycle, air dry.

Step by step: washing polyester in a machine

This routine suits tees, polos, dresses, blouses, linings, activewear and pants made of polyester.

1. Sort. Sorting by color and by care instructions is the starting point of any good wash, according to the American Cleaning Institute. Keep dark polyester away from whites, and keep rough items like jeans and towels out of the load, since they rub against smooth fabric.

2. Pretreat stains. Rub a little liquid detergent or a prewash stain remover into the spot. More on this below.

3. Turn pieces inside out. Sweat and skin oils collect on the inside of a garment. Consumer Reports quotes a Procter & Gamble fabric care expert who says turning garments inside out exposes those areas directly to the wash action, which improves cleaning and odor removal. It also protects prints and surface finishes from friction.

4. Close zippers and hooks. Snags show clearly on smooth polyester.

5. Pick the cycle. Choose gentle or permanent press, with cold or warm water.

6. Measure the detergent. Use less than you think you need (see the next section).

7. Do not overload. Clothes need room to move and rinse. A packed drum leaves soap behind and creases fabric.

8. Remove promptly. Take the load out when it ends and shake each piece. Damp polyester left in the drum can pick up a musty smell.

What water temperature works for polyester

Cold or warm. That is the whole answer for most garments.

Whirlpool’s guidance is that 100% polyester is generally durable and machine washable, and that you should use warm or cold water with a gentle or permanent press cycle. Here is how to choose between them:

• Cold water is the safest option for dark colors, printed fabrics, stretch blends and anything you are unsure about. It protects dye and elasticity.

• Warm water helps on body-oil buildup, such as on work shirts, polos and gym tops, because oils loosen more easily when the water is not cold.

• Hot water is the one to avoid. Hot settings can damage polyester fibers, and hot water can set oil-based stains permanently.

So if you are asking about a specific number, check your washer’s dial labels and the garment tag first. The tag always wins.

Does polyester shrink?

Rarely, and almost never in a normal cold or warm wash. Industry guidance from Whirlpool notes that polyester seldom shrinks in cold or warm water, while high heat in the washer or dryer can damage the fibers and potentially cause shrinkage or heat-set stains.

In practice, that means the following:

• A 100% polyester piece that comes out smaller was almost certainly exposed to a hot dryer or hot wash. Heat can distort the fiber and make the fabric pucker or lose its drape.

• A blend with cotton or rayon can shrink because of the natural fiber, even when the polyester part holds steady. Check how a polyester-cotton blend compares with cotton alone before you decide what to buy.

• Knits and fitted garments can look shrunken after a rough wash simply because they stretched and then bunched. Reshape them while damp.

If a piece has already been through a hot dryer, do not wash it hot to “reset” it. A cool rinse and a flat dry is the gentlest thing you can try, though heat damage to polyester is often permanent.

Detergent: use less than you think

Polyester is a synthetic fiber, and it holds on to body oils. That makes it tempting to add more soap. Do not.

Consumer Reports advises that with modern concentrated liquid detergent you only need about a shot glass worth, and that extra detergent does not get clothes cleaner. It can leave residue that attracts more dirt and causes odor, and it can turn your washer into a mold farm. If a shirt still smells after washing, an extra rinse cycle is often a better move than another squirt of soap.

A few practical rules:

• Use a mild liquid detergent. Liquids dissolve fully in cold water, while powders can leave streaks on dark synthetics.

• Skip chlorine bleach on colored polyester unless the label allows it.

• Skip fabric softener on activewear and performance fabrics. Softener coats fibers and can make them hold odor and stop wicking moisture well. On everyday polyester it is optional at best.

• If you have a high-efficiency machine, use detergent made for it, and measure with the cap or a measuring cup, not by eye.

Stains and smells on polyester

Oil and grease stains

Polyester loves oil, which is why a salad dressing spot can look permanent. Rub a small amount of liquid detergent or a prewash stain remover directly into the stain, let it sit, then wash in cool or warm water. Whirlpool says to avoid hot water on stains, because it can set oil-based marks. Check the spot before you dry the garment. If it is still visible, repeat the treatment, since a dryer will lock it in.

Sweat and body odor

Synthetic fibers do not soak up sweat the way cotton does, but sweat residue and oils still cling to the surface and produce odor. Three things help most:

1. Wash inside out, as above.

2. Cut back on detergent so residue does not build up.

3. Wash soon after wearing. Do not leave a damp gym top in a bag overnight.

For heavily soiled uniforms or workout gear, Whirlpool describes a pre-soak in a bucket with 1/4 cup of detergent and one cup of baking soda for at least an hour, then a normal wash. Use cool or lukewarm water for the soak.

A stubborn musty smell

Run the garment through a second rinse, or rewash it with a measured, smaller dose of detergent. Also check the washer itself: if clothes from every load smell, the machine may need cleaning according to its manual.

Drying polyester and getting wrinkles out

Polyester dries fast, which is one of its best traits. The best method is to hang it or lay it flat. If you use a dryer, choose low heat or a permanent press setting, and take items out while they are still slightly damp. High dryer heat is the main cause of heat damage and shrinkage in polyester, so this step matters as much as the wash.

Wrinkles in polyester usually relax with steam rather than a hot iron. A hot iron can melt or shine the fabric surface, so use the lowest setting, and a pressing cloth if you must iron. A handheld or standing steamer is the easiest tool for dresses and blouses; if you are comparing options, this roundup of garment steamer deals is a place to start, though note that it lists offers in the UK market.

Hang steamed clothes for a few minutes before wearing so the fabric can cool and set.

Washing polyester blends, coats and shoes

Wool blends. A polyester-wool coat looks sturdy, but heat and agitation can felt the wool. Our guides on wool coat care at home and reading the label on a wool blend versus wool explain how to decide between a gentle hand wash and the dry cleaner.

Polos and work shirts. Polyester polos collect oils at the collar and underarms. Wash them inside out, pretreat the collar, and hang them to dry so the collar keeps its shape.

Down and fleece jackets. Check the label first. Fleece is polyester, so it follows the same cool, gentle logic, and it should skip fabric softener because softener can flatten the pile.

Fabric sneakers and slippers. Textile footwear often has polyester uppers. If you want a practical walk-through, this guide to washing fabric sneakers is written in Croatian, but its photos and steps are easy to follow. In general, use a gentle cycle in a mesh bag or hand wash, then air dry.

New clothes. Wash new polyester before the first wear. Textile experts quoted by Consumer Reports, including NC State’s Karen Leonas, recommend washing new clothes first, especially if you have sensitive skin or are buying for babies, because finishes and excess dye can remain on the fabric from manufacturing.

Polyester and microfiber shedding

Every wash releases tiny synthetic fibers into the wastewater. A 2024 study on microfiber emissions from top-loading machines notes that washing gradually breaks down polyester in clothing, and that textile type, load weight and detergent dosage all play a part. You can reduce shedding without special gear by washing full but not stuffed loads, using gentle cycles, measuring detergent, and washing polyester only when it needs it. Shirts worn briefly can often be aired out instead.

Our view on caring for polyester

We sell everyday clothing in a range of fabrics, from polyester polos to warm wool blends, so we see the same pattern in how people care for them: nobody ruins a garment because polyester is delicate. They ruin it because of a hot dryer, a heavy hand with detergent, or ignoring a blend’s label.

Our advice is simple. Buy pieces you will actually wash the way the tag says. If you want a shirt for work that you can throw in with a normal load, polyester or a polyester blend is a good fit. If you love wool or cotton, that is fine too, but accept that it needs a gentler routine. Fabric choice and care routine go together, and the guides on recycled polyester versus cotton and what to wear in hot, humid weather cover that trade-off.

And keep the dryer on low. If you only change one habit, make it that one.

— Joseph Kvarnstrom

Shop easy-care polyester pieces

If you are replacing a shirt that did not survive the dryer, take a look at our men’s long sleeve polyester polo, or browse the full range of polos, coats, dresses and more in our collection. Check each product page for fabric details and care instructions before you order, and keep the tag on hand when you wash.

FAQ

Can you wash 100% polyester in a washing machine?

Yes. Whirlpool describes 100% polyester as generally durable and machine washable. Use a gentle or permanent press cycle with cold or warm water, and check the garment’s care label for anything unusual, such as embellishments or a lining.

Does polyester shrink in the dryer?

It can if the heat is high. Polyester rarely shrinks in cold or warm water, but high dryer heat can damage the fibers and cause shrinkage. Use low heat or air dry, and pull items out while they are slightly damp.

How do I get the smell out of polyester?

Start by washing the garment inside out with a measured amount of detergent, because too much soap leaves residue that holds odor. Add an extra rinse cycle if the smell persists. For heavily soiled gear, a one-hour pre-soak with detergent and baking soda can help.

What temperature should I wash polyester at?

Cold or warm water, set by the care label. Cold is safest for dark, printed and stretchy pieces. Warm helps on oily items like work shirts. Avoid hot water, which can damage the fibers and set oil-based stains.

Should I use fabric softener on polyester?

It is optional on everyday polyester and best skipped on activewear and fleece. Softener can coat the fibers and reduce how well the fabric handles moisture. If you want soft clothes, a measured amount of detergent and an extra rinse often does more.

Sources

• How to Wash & Dry 100% Polyester & Poly Blends, Whirlpool
• Laundry Basics, American Cleaning Institute
• How to Wash Lululemon and Other Workout Clothes, Consumer Reports
• Your Guide to Really Clean Clothes, Consumer Reports
• Wash New Clothes Before Wearing Them for the First Time, Consumer Reports
• The Influence of Textile Type, Textile Weight, and Detergent Dosage on Microfiber Emissions from Top-Loading Washing Machines, PMC

Recommended

• Every Wash Changes the Recycled Polyester vs Cotton Choice
• 65/35 Blends Often Win for Shoppers: Cotton vs Polyester Shirts