To clean a silicone swim cap, rinse it inside and out with cool fresh water straight after every swim, give it a gentle hand wash with a drop of mild soap whenever it feels greasy, then let it air-dry completely, away from heat and direct sun, before you store it loose in a dry place. That is the whole job, and it takes less time than finding your locker key.
The method is not the hard part. Doing it in a crowded changing room, with a wet towel, a heavy kit bag and a bus to catch, is. The routine below is built for real life. If your cap already smells, start with our guide to getting the smell out of a swim cap, then come back here to stop it returning.
The after-swim routine, from pool deck to cupboard
- Take it off with both hands. Slide your fingers under the front edge and peel the cap back over your head. Hooking one finger under the rim and yanking is how most small nicks start. Our guide to taking off a swim cap without pulling your hair covers the technique.
- Rinse both sides in the shower. Turn the cap inside out under cool or lukewarm fresh water, then back again. The inside holds sweat, skin oils and hair product; the outside carries most of the pool water. A dunk back in the pool is not a rinse.
- Shake and blot. Flick off the drops and pat it with a corner of your towel. No wringing, no twisting.
- Pack it loose for the trip home. An outside pocket or a mesh bag works well. Rolled up inside a wet towel is the worst place it can travel.
- Unpack it as soon as you get home. This is the step everyone skips, and the one that matters most.
- Air-dry it fully. Lay it flat on a clean, dry surface with the edge opened so air can reach the inside, and turn it over once so both sides dry.
- Store it only when it is dry to the touch, inside and out. A printed outside can look dry while the inside is still damp.
When a rinse is not enough: the gentle hand wash
A fresh-water rinse after every swim does most of the work. Add a proper wash about once a week if you swim several times a week, or whenever the inside feels slick from conditioner, hair oil or sunscreen.
- Fill a basin with lukewarm water, not hot.
- Add a drop of mild hand soap, gentle shampoo or washing-up liquid. More soap only means more rinsing.
- Turn the cap inside out and rub the inside with your fingertips, paying most attention to the band that sits along your hairline.
- Turn it back and wipe the outside gently. Fingertips or a soft cloth are plenty for a printed design.
- Rinse until the surface no longer feels slippery, then dry it as above.
Rinse for longer than you think you need to. Soap left on the silicone feels filmy, collects grime faster, and can irritate a sensitive scalp.
What to use on a swim cap, and what to keep well away
| Item | Use it? | Why |
|---|---|---|
| Cool or lukewarm fresh water | Yes, after every swim | Removes pool water, salt and sweat before they sit on the cap. |
| Mild soap, gentle shampoo or washing-up liquid | Yes, now and then | Lifts hair product and skin oils from the inside. |
| Fingertips or a soft cloth | Yes | Cleans without scratching the print. |
| Washing machine or dishwasher | No | Care labels say hand wash, and a drum full of zips is no place for a thin, stretchy cap. |
| Tumble dryer, radiator, hairdryer or sunny windowsill | No | Care labels warn against direct heat, strong sun fades prints, and there is no prize for drying fast. |
| Bleach, solvents, alcohol wipes or hand sanitiser | No | Far harsher than the job needs, and printed designs suffer first. |
| Scourers and stiff brushes | No | They scratch the surface, and grime clings to scratches. |
| Talc or cornflour | Not needed | A latex-cap habit. Clean, dry silicone does without it. |
For our own caps the care line is deliberately short: hand wash, air dry. It is the same for every design in the CutWave swim cap range, so you only have to learn it once. If your cap is from another brand or made of another material, follow its label. Latex and fabric caps behave differently, as our silicone vs latex vs Lycra comparison explains.
How to store a silicone swim cap
Between sessions
Keep it somewhere dry, shaded and away from sharp things: a drawer, a shelf, or a mesh bag on a hook. Store it loose rather than squashed into a tight wad or stretched over anything. Keys, hair grips, zips and the clasp on your goggle case are the real enemies in a kit bag.
In your kit bag
A dry cap can live in your swim bag, ideally in its own pocket. A damp one should not stay there overnight. Avoid leaving the bag in a parked car in summer, because the inside of a car in the sun gets far hotter than any pool hall.
Several caps, or the off-season
If you own a few caps, don't leave them pressed together print to print in a warm cupboard for weeks, as silicone surfaces can cling to each other. A sheet of paper between them avoids the argument. Before a long break, wash and dry the cap properly, store it flat in a cool, dark drawer, and check it before your first swim back.
Sea swims, lakes, long hair and kids' caps
- Sea water: rinse the cap as soon as you can. Salt dries into a white crust that looks worse than it is, but it does not belong on the cap until your next swim.
- Lakes and rivers: silt, algae and the odd bit of weed collect on the inside. Rinse the inside thoroughly before the cap goes anywhere near your bag.
- Long, curly or braided hair: leave-in conditioner and oils build up on the inside faster, so wash rather than just rinse after any session where you used product. Our guide to protecting braids, curls and textured hair under a cap covers the hair side.
- Kids: children's caps tend to spend the weekend in the school swim bag. Make “cap and goggles out” part of the same routine as emptying the lunchbox.
- Racing in two caps: the under-cap is often latex, which sticks to itself when it is stored damp or warm. Rinse and dry both caps, not just the one on top.
A 20-second check before your next swim
While the dry cap is in your hands anyway, run a fingertip around the edge, stretch the crown gently towards a light, and sniff the inside. A nick at the rim or a patch that looks thinner than the rest means the cap is on borrowed time, and our guide on how often to replace a swim cap covers the keep-or-bin decision. A cap that simply feels looser than it used to is a different question, answered in whether swim caps stretch out over time.
FAQ
Do I need to wash a brand-new swim cap before wearing it?
It is not essential, but a quick rinse and air-dry is a sensible habit with any new kit. It also gives you a chance to check the edge at home rather than on the pool deck.
Can I clean a swim cap with baby wipes?
In a pinch, yes, but wipes can leave fragrance and residue on the silicone that ends up on your scalp. Rinse the cap with fresh water afterwards and treat wipes as a stopgap, not the routine.
How long does a silicone swim cap take to dry?
In a warm, airy room, a rinsed and blotted cap is often dry within a few hours. Overnight is the safe bet, and checking the inside by touch beats guessing from the outside.
Is it hygienic to share a swim cap?
It is better not to, for the same reasons you would not share a hat or a hairbrush. If a lane mate borrows yours in an emergency, give it a proper hand wash and a full dry before you wear it again.