TL;DR
If a squirt toy has black growth inside, you cannot reliably clean it out, because you cannot see inside or verify the result. The honest options are to replace the toy or to permanently seal the hole so water never gets in again. Everything else in the bath basket washes and dries normally.
Why the inside of a squeeze toy is unfixable
A classic squirt toy is a hollow shell with one pinhole. Squeezing it pulls bathwater in, and the water carries soap, skin cells, and whatever else is in the tub.
That water does not fully leave. A little stays in the bottom of the cavity after every bath, and the toy sits warm and dark and closed for the next twenty-three hours.
Squeezing harder does not fix it, and neither does flushing. You cannot reach the interior surface with a brush, you cannot see whether you removed anything, and you cannot verify the result afterward.
That is the whole problem in one sentence: a cleaning method you cannot verify is not a cleaning method.
How do you get mold out of a squirt toy?
You generally cannot remove it reliably, because the interior cannot be reached, scrubbed, or inspected. The two honest options are to throw the toy away or to permanently seal the pinhole with waterproof adhesive so it becomes a float-only toy that water can never enter again. Rinsing and soaking do not solve it.
Some people flush the inside with hot soapy water or a vinegar solution and squeeze it out repeatedly. That removes some loose material and it does not reach the film bonded to the interior wall.
Do not use bleach inside a mouthing toy. You cannot rinse the inside either, so any bleach residue stays in the cavity.
Never mix bleach with ammonia or with an acid such as vinegar. Both combinations release toxic gas.
The full explanation of how water gets in and never leaves is in why rubber ducks get moldy inside.
Sealing the hole is a real fix
If the toy is not already contaminated, sealing the pinhole with a waterproof, fully cured adhesive turns it into a solid float toy. Water never gets in, so nothing ever grows in it.
Do this only on a toy that is currently clean and dry inside. Sealing a toy that already has growth just traps it.
Let the adhesive cure completely per its own instructions before the toy goes back in water, and check the seal periodically.
If sealing is not appealing, buying squirt-free bath toys from the start avoids the issue entirely. Solid molded toys, cups, and boats have no cavity.
Cleaning the toys that can be cleaned
Solid plastic toys, cups, stacking sets, and boats are easy. Wash them in hot soapy water with a brush, rinse well, and let them dry fully.
Many are dishwasher safe on the top rack. Check for a marking, and skip the dishwasher for anything with a sticker, a sound box, batteries, or a light.
Anything with electronics is surface wiped only and never submerged. That includes battery-powered spinners and light-up toys.
Foam letters and sponges are absorbent by design. Wring them out hard after each bath, and replace them when they will not come clean, because you cannot dry the middle of a sponge reliably.
Drying is what actually prevents this
After every bath, get the toys out of the water. A hanging mesh bag or a wall basket with drain holes works far better than a bucket that pools water in the bottom.
Shake each toy out and let air reach it. A toy that dries within a couple of hours does not develop growth.
Do not store bath toys in a closed container. That is a humid box.
Run the bathroom fan or crack a window after baths. A drier room dries toys faster, and the same logic applies to the tub itself, covered in how to clean a baby bathtub and sling.
A weekly wash routine
Once a week, pull every toy out and wash the washable ones in hot soapy water. Brush the seams and the underside of cups where scum collects.
Rinse thoroughly. Bath toys go directly into mouths, so soap residue is worth removing.
While you are there, inspect. Any toy that is cracked, split, discolored inside, or that squirts out cloudy water gets thrown away.
Wash the storage bag or basket too, and let it dry. That gets forgotten and it stays wet.
Being honest about the health question
Growth in a bath toy is unappealing and it is a good reason to replace the toy. It is not a diagnosis, and cleaning a toy does not treat or prevent any illness.
If your child has a specific health concern, a weakened immune system, or a persistent symptom, that is a conversation with your pediatrician rather than a cleaning decision.
A widespread mold problem in a bathroom is a separate issue from a toy, and remediation is a different trade. Replacing toys does not address moisture in a room.
What to buy next time
Solid, cavity-free toys. Cups, scoops, boats, stacking rings, and floating shapes with no hole.
Toys that come apart for cleaning, where you can actually reach every interior surface.
Silicone and hard plastic over absorbent foam, if drying is a struggle in your bathroom.
Bath books have their own version of this problem, covered in how to clean vinyl bath books, and our guide to cleaning baby gear and kids equipment safely covers the rest of the kit.
FAQ
Can you clean mold out of a rubber duck?
Not reliably. The interior cannot be reached with a brush, inspected, or verified after cleaning, so flushing and soaking only remove loose material. The honest options are to throw the toy away or, if it is currently clean and dry inside, to permanently seal the pinhole so water can never enter again.
Is mold in bath toys dangerous?
It is unappealing and a good reason to replace the toy, but this is not medical advice and cleaning a toy does not treat or prevent any illness. If your child has a health concern, a weakened immune system, or ongoing symptoms, ask your pediatrician rather than treating it as a cleaning question.
Should you use bleach on bath toys?
Not inside a sealed squirt toy, because you cannot rinse the interior and any residue stays in a toy that goes into a mouth. Wash washable toys with hot soapy water instead. Never mix bleach with ammonia or with an acid such as vinegar, since both release toxic gas.
Can bath toys go in the dishwasher?
Solid plastic toys often can, on the top rack, if they are marked dishwasher safe. Skip the dishwasher for anything with a sound box, batteries, lights, stickers, or a sealed cavity that traps water. Hand wash those in hot soapy water instead and dry them thoroughly.
How do you stop bath toys from getting moldy?
Get them out of the water after every bath, store them where air circulates and water drains, such as a hanging mesh bag, and choose solid toys with no pinhole. Run the bathroom fan so the room dries faster. Prevention works; cleaning a sealed cavity afterward does not.
How often should bath toys be washed?
Wash the washable ones weekly in hot soapy water, brushing seams and the undersides of cups, and rinse thoroughly since they go into mouths. Inspect at the same time and discard anything cracked, discolored inside, or squirting cloudy water. Wash the storage basket and let it dry too.
Damp bathrooms need steady attention, and the rest of the house does too. If you would rather hand that off, our house cleaning services can take it. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.