Swimwear Smells Musty After Storage? How to Fix It

Quick answer

A musty swimsuit is almost always holding onto moisture and residue, not permanently damaged. Rinse it in cool water right after wearing, wash it with a small amount of mild detergent, dry it fully in the shade, and store it loose and dry. If the smell survives two proper washes, or the fabric feels slimy or stiff, stop treating it and replace the piece.

You pull your swim out for a late-season swim or a warm-weather trip, and it hits you before you even put it on: that damp, closed-in smell. It is one of the most common swimwear storage problems, and it rarely means the suit is finished. It usually means something stayed wet, folded, or sealed away for too long.

The fix depends on where the smell is coming from. Below you will find a simple way to tell the difference between a suit that just needs a proper wash and one that has actually broken down, plus the storage habits that keep it from happening again.

Start with the symptom: what the smell is telling you

A musty swimsuit smell is a moisture problem first. Chlorine, salt, sunscreen, and body oils leave a film on the fibers, and if the suit goes into a bag or drawer even slightly damp, that film becomes a place for odor to settle in. The smell is strongest at the straps, lining, and seams because those areas hold water the longest.

Pay attention to how the suit feels as well as how it smells. A dry, slightly rough surface that smells musty is usually just residue and needs a wash. A slick, slimy feel, a sour note that lingers after washing, or fabric that has gone stiff and lost its stretch points to a different problem.

• Smell strongest at straps and lining: moisture trapped in thicker areas.
• Smell fades after one wash: residue, not damage.
• Smell returns within a day of drying: the piece never fully dried before storage.

Wash it properly, not aggressively

Hand wash in cool water with a small amount of mild detergent, and work the water through the fabric rather than scrubbing it. Rinse until the water runs clear. If the smell is stubborn, soak for 15 to 30 minutes in cool water with a tablespoon of baking soda, then rinse again. Skip bleach, fabric softener, and hot water, all of which stress stretch fibers and can set odor rather than remove it.

Never wring or twist swim fabric to speed up drying. Press it flat between two towels to lift out excess water, then reshape it by hand. This keeps the suit from stretching out while it dries, which matters just as much as getting the smell out.

• Cool water and mild detergent only; no bleach or softener.
• Press between towels instead of wringing.
• Reshape straps and cups before drying so they hold their fit.

Dry it fully, then store it loosely

Dry swim flat or hanging in the shade, not in direct sun, and not in a sealed bag. Give it a full day, and check the lining and straps by hand before you call it dry. If any part feels cool or damp to the touch, it is not ready to be put away, and that is exactly how the smell comes back.

For storage, keep swim separate from damp towels and gym bags, and avoid airtight containers for long periods. A breathable drawer or a cotton pouch works well. If you rotate several suits, store them unfolded enough that air can move between them; a tight stack traps the same moisture you just worked to remove.

• Shade-dry, never in a hot car or sealed bag.
• Check the lining and straps by touch, not by look.
• Store loose in a breathable spot, away from damp gear.

After the beach or pool: the five-minute routine

The best swimsuit care after beach or pool days is boring and fast. Rinse the suit in cool water as soon as you can, even if that means a quick rinse in a shower before you leave. This removes chlorine, salt, and sunscreen before they have time to sit in the fibers. If you cannot rinse right away, at least keep the wet suit out of a sealed bag.

When you get home, wash it properly rather than just rinsing, then dry it fully. If you are traveling and washing is not possible, hang the suit to dry overnight and pack it only once it is completely dry. A wet suit packed at the bottom of a bag is the single most common cause of the smell you are trying to fix.

• Rinse immediately after wearing, even a quick one.
• Never leave a wet suit in a sealed bag overnight.
• Pack swim last, and only when fully dry.

When to stop treating and replace instead

Stop treating the smell when two proper washes and a full dry have not changed it, when the fabric feels slick or slimy, or when the suit has lost its stretch and no longer holds its shape. At that point the fibers have broken down, and no wash will bring them back. Continuing to soak and wash a degraded suit only wears it further.

Replace with pieces that are easy to rinse and dry completely. A supportive one-piece with a strappy back, like the Playa One Piece, dries in the same simple way as any other swim piece, and a mix-and-match top such as the Catarina Bikini Top lets you rotate one piece while the other dries fully.

• Two washes with no improvement: replace, do not keep soaking.
• Slimy or stiff fabric: the fibers are done.
• Lost stretch: fit will not recover, regardless of smell.

Diagnose the smell before you treat it

• Smells musty but feels normal and dry: Residue from chlorine, salt, sunscreen, or body oils is holding odor in the fibers. Hand wash in cool water with mild detergent, soak with baking soda if needed, then dry fully in the shade. If the smell is gone after one wash, you fixed it. Repeat the routine after every wear to keep it that way.
• Smell returns a day after drying: The suit was not fully dry when it was stored, most likely at the lining, straps, or pads. Check those areas by touch, remove removable pads, and let everything air until completely dry before putting it away. This is a storage habit problem, not a fabric problem. Fix the drying step and the smell stops coming back.
• Smells sour, feels slimy, or has gone stiff: The fibers have broken down and odor is now inside the material. Washing will not reverse it, and further soaking only weakens the suit. Stop treating and replace the piece. Choose swim you can rinse and dry completely, and store it loose and dry from day one.

Swim pieces that make proper care easier

• Catarina Bikini Top: A versatile swim top featuring adjustable straps, removable pads, and a smooth, cool handfeel, offered in a range of versatile colours made to mix, match, and rotate all summer. Removable pads and adjustable straps come out and dry separately, so there is no damp padding left inside the suit to hold odor.
• Playa One Piece: A classic, supportive one-piece made for confident movement, with a flattering fit, secure coverage, and a refined strappy back. A single piece is quick to rinse and easy to lay flat to dry, which makes the after-swim routine simpler and lowers the odds of storing it damp.

Musty swim is usually a drying and storage problem, not a dead suit. Rinse it right after wearing, wash it gently, dry it completely, and store it where air can reach it. Do that consistently and you will spend your swim days swimming, not troubleshooting the smell.