How to Wash Your Swimwear and Why You Should Never Put It in the Washing Machine

Swimwear lives a glamorous life in theory: ocean waves, poolside lounging, beach photos, sunscreen-scented afternoons, and maybe one dramatic slow-motion walk toward the water. In reality, your swimsuit is basically a tiny stretch-fabric superhero battling chlorine, salt, sweat, body oils, sunscreen, sand, heat, and the mysterious contents of public pool water. It deserves better than being tossed into the washing machine with towels, socks, and a rogue hoodie zipper.

Learning how to wash swimwear properly is one of the easiest ways to keep your bathing suits looking bright, fitting snugly, and lasting more than one summer. The short answer is simple: rinse it right away, hand wash it gently in cold water, remove moisture without wringing, and air dry it away from harsh heat. The longer answer explains why your washing machine is usually the villain in this story.

This guide breaks down exactly how to wash swimsuits, bikinis, swim trunks, rash guards, and performance swimwear without stretching them into sad, saggy memories. You will also learn how to remove sunscreen residue, avoid chlorine damage, dry swimwear correctly, and store it so it is ready for the next beach day instead of smelling like a forgotten gym bag.

Why Swimwear Needs Special Care

Most modern swimwear is made from stretchy synthetic fibers such as nylon, polyester, spandex, elastane, Lycra, or chlorine-resistant blends. These fabrics are designed to hug the body, move with you, dry quickly, and survive repeated contact with water. That does not mean they are indestructible. In fact, the very stretch that makes swimwear comfortable is also what makes it vulnerable.

Elastic fibers can weaken when exposed to heat, harsh detergents, aggressive spinning, and constant friction. Colors can fade when suits are left in chlorine or direct sunlight for too long. Padding, underwire, straps, ties, embellishments, and seams can lose their shape when twisted or pulled. In other words, swimwear is not regular laundry. It is a delicate garment pretending to be sporty.

What Your Swimsuit Is Fighting After Every Wear

• Chlorine: Helps keep pools clean, but it can break down elastic fibers and fade colors over time.
• Saltwater: Leaves mineral residue that can make fabric feel stiff or gritty.
• Sunscreen: Oils and UV filters can cling to fabric and cause yellowish or greasy stains.
• Sweat and body oils: These build up in fibers and can create odor if not rinsed out.
• Sand: Tiny grains can lodge in seams and linings, acting like miniature sandpaper.
• Heat: Hot water, dryers, and hot tubs can weaken stretch and distort fit.

Why You Should Never Put Swimwear in the Washing Machine

Technically, some care labels allow machine washing on a cold, delicate cycle inside a mesh laundry bag. But as a general rule, you should never put swimwear in the washing machine as your default cleaning method. The machine may be convenient, but convenience is exactly how many swimsuits meet an early, floppy retirement.

A washing machine cleans by agitation, tumbling, spinning, and water movement. That is excellent for jeans and towels. It is less excellent for thin straps, molded cups, tie-side bikini bottoms, delicate linings, elastic waistbands, and decorative hardware. Even a gentle cycle can stretch swimwear, rough up fibers, loosen stitching, or cause the suit to rub against other garments.

1. Machine Agitation Stretches Elastic

Swimwear relies on elastic recovery, meaning the fabric stretches and then snaps back to shape. Machine agitation pulls fabric in multiple directions over and over. After enough cycles, the suit may stop hugging properly. The waistband gets lazy. The straps get longer. The bottom starts doing whatever it wants. Nobody invited that.

2. Zippers, Hooks, and Towels Can Snag the Fabric

Swimsuit fabric is smooth but delicate. If it shares a washer with rough towels, denim, zippers, Velcro, or bra hooks, it can snag, pill, or tear. Even tiny snags can turn a sleek swimsuit into something that looks like it lost a fight with a beach chair.

3. Spin Cycles Can Damage Shape

The spin cycle removes water by force. That force can flatten padding, twist straps, bend underwire, or distort seams. Swimwear should be pressed gently, not spun like it is training for a laundry-room Olympics.

4. Regular Detergent Can Be Too Harsh

Many regular laundry detergents are designed for heavier soil and larger loads. Used too generously on swimwear, they may leave residue or be harsher than necessary. A mild detergent for delicates, a swimwear-specific wash, or a small amount of gentle soap is usually a better choice.

5. Heat Is the Enemy of Stretch

Hot water and machine dryers are especially risky. Heat can weaken spandex and elastane, fade colors, and make fabric lose its smooth recovery. If your swimsuit could talk, it would see the dryer door opening and whisper, “Please, no.”

How to Wash Swimwear the Right Way

The best way to wash swimwear is by hand. It is fast, easy, and much gentler than machine washing. You do not need a laundry degree, a special sink, or a dramatic soundtrack. You just need cold water, mild detergent, a clean towel, and a few minutes.

Step 1: Rinse Immediately After Swimming

As soon as possible after swimming, rinse your suit in cool, clean water. This removes much of the chlorine, salt, sand, sweat, and sunscreen before it settles into the fibers. If you are at the beach or pool, rinsing in a shower is enough until you can wash it properly at home.

Do not leave wet swimwear rolled up in a towel, trapped in a plastic bag, or hiding at the bottom of your tote. That creates the perfect little vacation home for odors and mildew. Your swimsuit enjoyed the water; it does not want to marinate in it.

Step 2: Fill a Sink or Basin With Cold Water

Use cold water, not hot. Cold water helps preserve color, shape, and elasticity. Hot water can make fabrics fade faster and weaken stretch fibers. If your suit has bright colors, prints, metallic details, or delicate trim, cold water is even more important.

Step 3: Add a Small Amount of Mild Detergent

Add a teaspoon or so of mild detergent, delicate wash, or swimwear wash. You do not need much. Too much detergent can be difficult to rinse out and may leave the fabric feeling sticky or stiff. Think “tiny splash,” not “soap bubble party.”

If the suit only needs refreshing, a short soak in cold water with a little baking soda can help reduce odor. For regular cleaning, however, a mild detergent is usually enough.

Step 4: Swish Gently

Submerge the swimsuit and gently swish it through the water. Lightly massage areas that collect sunscreen, sweat, or body oil, such as straps, waistbands, underarms, chest areas, and leg openings. Do not scrub aggressively. Swimwear fabric is not a kitchen pan.

Step 5: Soak Briefly

Let the suit soak for about 10 to 15 minutes. This gives the detergent time to loosen residue without overworking the fabric. For very delicate pieces, shorter is better. For swim trunks or rash guards, a slightly longer soak is usually fine.

Step 6: Rinse Until the Water Runs Clear

Drain the soapy water and rinse the swimsuit thoroughly with cold water. Keep rinsing until the water is clear and the fabric no longer feels slippery. Detergent residue can attract more grime and irritate skin, so do not rush this step.

Step 7: Press Out WaterDo Not Wring

Never twist or wring swimwear. Wringing stretches elastic and can damage seams. Instead, gently press the suit between your hands. Then lay it flat on a clean towel, roll the towel up, and press lightly to absorb extra moisture. This towel-roll method removes water without abusing the fabric.

Step 8: Air Dry Flat or Line Dry in Shade

Lay the swimsuit flat on a dry towel or drying rack, or hang it carefully so the weight of the water does not stretch the straps. Choose a shaded, well-ventilated spot. Avoid direct sunlight for long drying periods because strong sun can fade colors. Never use a machine dryer unless your goal is to turn a perfectly good swimsuit into a cautionary tale.

How Often Should You Wash Swimwear?

You should rinse swimwear after every wear, even if you only dipped your toes in the water and spent most of the day pretending to read a book. Chlorine, salt, sunscreen, sweat, and oils can still collect on the fabric.

For a full wash, hand wash after each use if the suit was exposed to pool water, ocean water, heavy sweating, sunscreen, or hot tubs. If you wore it briefly as a bodysuit or cover-up and stayed dry, a rinse or gentle refresh may be enough. When in doubt, wash it gently. The key word is gently.

How to Remove Sunscreen Stains From Swimwear

Sunscreen is essential for skin protection, but it can be clingy. Mineral sunscreens, oil-based formulas, and some chemical UV filters may leave yellow, orange, or greasy marks on swimwear. The sooner you treat the stain, the better.

For Fresh Sunscreen Marks

1. Rinse the stained area with cool water.
2. Apply a tiny amount of mild detergent directly to the spot.
3. Gently work it in with your fingers.
4. Let it sit for 10 minutes.
5. Rinse thoroughly and hand wash as usual.

For Greasy Residue

If the stain feels oily, a small drop of gentle dish soap can help break down the grease. Use it carefully and rinse very well. Do not use harsh stain removers, chlorine bleach, or abrasive brushes on swimwear. They may remove the stain, but they may also remove your swimsuit’s will to live.

For Odor

If a swimsuit smells musty, soak it briefly in cold water with a small amount of baking soda, then rinse and hand wash. The most important fix is drying it completely before storing. A damp suit in a drawer is basically an odor factory with straps.

Can You Ever Machine Wash a Swimsuit?

If the care label specifically says machine washing is allowed, you can do it occasionally with precautions. Turn the swimsuit inside out, place it in a mesh laundry bag, use cold water, choose the delicate or hand-wash cycle, use mild detergent, and wash it only with similar lightweight items. Never wash swimwear with towels, denim, heavy clothing, or anything with rough hardware.

Still, hand washing is the safer choice, especially for bikinis, expensive suits, competition swimwear, molded-cup tops, embellished designs, and anything with underwire. Machine washing should be the emergency backup plan, not the weekly routine.

What Not to Do When Washing Swimwear

• Do not use hot water. Heat weakens stretch and can fade color.
• Do not use chlorine bleach. It can damage fibers and ruin color.
• Do not use fabric softener. It can leave residue and affect quick-drying performance.
• Do not wring the suit. Press water out gently instead.
• Do not tumble dry. Dryer heat can destroy elasticity.
• Do not iron. Swimwear and irons are not friends.
• Do not store it wet. Damp storage encourages mildew and odors.
• Do not dry it on rough surfaces. Concrete, pool decks, and wooden benches can snag fabric.

How to Make Swimwear Last Longer

Washing properly is only part of swimwear care. A few small habits can help your favorite suit survive the season and maybe even earn a comeback tour next summer.

Rotate Your Swimsuits

If you swim often, avoid wearing the same suit every day. Elastic fibers need time to recover between wears. Rotating two or three swimsuits gives each one time to dry fully and regain shape.

Shower Before Swimming

A quick rinse before entering the pool helps the fabric absorb clean water first, which may reduce how much chlorinated water it takes in. It is also good pool etiquette, which means everyone wins.

Sit on a Towel

Pool decks, rocks, boat seats, and rough lounge chairs can abrade swimwear. Sitting on a towel protects the fabric from pilling and snags. It also feels better than hot concrete, which is a bonus for your dignity.

Limit Hot Tub Use

Hot tubs combine heat and chemicals, two things swimwear does not love. If you use hot tubs often, consider designating one older or less expensive suit for that purpose.

Let It Dry Completely Before Storage

Before storing swimwear, make sure it is completely dry. Fold it loosely and keep it in a cool, dry drawer. Avoid sealing it in plastic bags for long periods. Swimwear likes airflow, not captivity.

Special Tips for Different Types of Swimwear

Bikinis

Wash bikini tops and bottoms together so they age at the same rate. Tie strings loosely before washing so they do not tangle. Be extra careful with padded or underwire tops; press water out gently and reshape cups before drying.

One-Piece Swimsuits

One-piece suits often have more seams, lining, compression panels, or shaping features. Avoid wringing at all costs. Lay flat to dry so the torso area does not stretch under the weight of water.

Swim Trunks

Swim trunks are often sturdier, but they still benefit from cold water and gentle detergent. Empty pockets before washing. Sand loves pockets. Sand also loves embarrassing you later when it appears on your bathroom floor.

Rash Guards and UPF Swim Shirts

Rash guards and UPF swim shirts should be washed gently to preserve stretch and performance. Avoid fabric softener, bleach, and high heat. Air dry them flat or on a hanger away from direct sun.

Competition Swimwear

Performance suits are designed for fit, compression, and speed. They are often expensive and sensitive to rough handling. Rinse immediately after swimming, hand wash only when needed, avoid twisting, and never put them in a machine dryer.

Common Swimwear Washing Mistakes

Mistake 1: Waiting Until Later

The longer chlorine, salt, and sunscreen sit in the fabric, the more damage they can do. Rinsing takes less than a minute and saves you from buying a replacement suit too soon.

Mistake 2: Using Too Much Detergent

More soap does not mean cleaner swimwear. It often means more residue. Use a small amount and rinse thoroughly.

Mistake 3: Drying in Direct Sunlight All Day

A little airflow is good. Baking your suit in harsh sun for hours is not. Shade drying helps preserve color and elasticity.

Mistake 4: Hanging Wet Suits by the Straps

Wet swimwear is heavier than it looks. Hanging a wet one-piece or bikini top by the straps can stretch them out. Lay flat when possible.

Mistake 5: Treating Swimwear Like Gym Clothes

Swimwear and activewear have similarities, but swimsuits face chlorine, salt, sunscreen, and constant water exposure. They need faster rinsing and gentler washing.

Personal Experience: What Actually Works in Real Life

The best swimwear care routine is the one you will actually do. A perfect 12-step laundry ritual sounds lovely until you come home tired, sandy, sun-warmed, and carrying half the beach in your tote bag. The trick is to make swimsuit care almost automatic.

One of the most practical habits is rinsing your swimsuit while you are still in “water mode.” After swimming, take the suit into the shower and rinse it right away. This removes the worst of the chlorine, salt, and sunscreen before you even get home. If you wait until later, “later” often becomes tomorrow, and tomorrow becomes “why does this bag smell like a swamp wearing coconut sunscreen?”

Another useful experience-based tip is to keep a small bottle of mild detergent near the bathroom sink during swim season. When the supplies are visible, hand washing feels easy. Fill the sink with cold water, add a tiny drop of detergent, swish the suit, let it sit while you rinse off or unpack your bag, then rinse and roll it in a towel. The whole process takes only a few minutes, but it can add months of life to the suit.

For families, the towel-roll method is a game changer. Kids often peel off swimwear and leave it in a damp pile, where it quietly develops a personality. Instead, rinse each suit, press out water, roll it in a towel, and place it flat on a drying rack. This prevents dripping, speeds drying, and keeps the laundry area from turning into a miniature indoor water park.

If you travel, pack a breathable wet bag or mesh pouch instead of a sealed plastic bag whenever possible. A sealed plastic bag is fine for a short ride home, but it should not become overnight storage. Once you reach your hotel or home, rinse the suit and hang or lay it flat to dry. Hotel bathrooms are not always ideal because they can be humid, so placing the suit near airflow helps.

Another real-world lesson: never wash your favorite swimsuit for the first time right before a big trip. Test your care routine at home. Make sure colors do not bleed, padding dries correctly, and any special details hold up. This is especially important for bright colors, white suits, textured fabrics, and embellished swimwear.

It also helps to rotate suits. Wearing the same swimsuit every day on vacation may feel simple, but the fabric never gets a proper break. Bring at least two suits if possible. Wear one while the other dries completely. Your suitcase may complain about the extra item, but your elastic will be grateful.

Finally, accept that expensive swimwear still needs gentle care. A higher price tag does not make a suit immune to chlorine, heat, or machine agitation. In fact, the more structured or delicate the suit, the more careful you should be. Treat swimwear like sunglasses: useful, stylish, and very easy to ruin by being careless for five seconds.

Conclusion: Gentle Care Keeps Swimwear Looking New

Swimwear may be made for water, but it is not made for rough laundry habits. The washing machine can stretch elastic, damage seams, snag delicate fabric, flatten padding, and shorten the life of your suit. Hand washing in cold water is the safest and most reliable method.

Rinse your swimsuit after every wear, wash it gently with mild detergent, press out water instead of wringing, and air dry it in the shade. Avoid hot water, bleach, fabric softener, dryers, and damp storage. These small habits protect color, shape, stretch, and comfort.

A well-cared-for swimsuit can last through pool days, beach trips, vacations, and backyard sprinkler emergencies. Treat it kindly, and it will keep showing up for summer looking bright, smooth, and ready for its next dramatic entrance.