Empty and rinse the tank weekly

The water tank is where bacteria and mineral buildup start, so cleaning it regularly keeps the whole unit working properly. Empty any remaining water from the tank at least once a week, even if the humidifier is still running—stagnant water grows mold faster than you might expect.

Rinse the tank under running water and use your hand or a soft cloth to wipe the interior surfaces. If you see white or tan crusty deposits (mineral buildup from hard water), fill the tank halfway with equal parts white vinegar and water, let it sit for 30 minutes, then scrub gently with a soft brush or cloth and rinse thoroughly. Do not use abrasive scrubbers or bleach, as these can damage the plastic.

Key Takeaways

  • Empty and rinse the water tank every week to prevent mold and mineral buildup, which are the most common problems in humidifiers.
  • The water outlet and nozzle clog easily with minerals; soak them in vinegar solution for 30 minutes and use a thin brush or pipe cleaner to clear blockages.
  • The base and underside of the tank collect standing water and require weekly wiping to stop mold from growing where you cannot see it.
  • Replace or clean the filter cartridge according to your model's manual—some are washable, others are disposable—because a clogged filter reduces mist output and can harbor bacteria.
  • If mineral buildup is heavy, run a full vinegar cycle through the humidifier once a month by filling the tank with equal parts vinegar and water and letting it run for 10 minutes.

Clean the water outlet and nozzle

The nozzle where mist comes out clogs with mineral deposits and stops releasing vapor evenly. Check it every week by looking for white buildup or reduced mist output. If you see deposits, soak the nozzle in a cup of equal parts white vinegar and water for 30 minutes.

After soaking, use a thin pipe cleaner, old toothbrush, or the small brush that came with your Dyson to scrub inside the nozzle opening. Rinse under running water and reattach. If the nozzle is still blocked, repeat the soak. For the water outlet inside the tank (where water flows from the tank to the misting mechanism), use the same vinegar soak and a pipe cleaner to clear any mineral buildup there.

Wipe down the base and underside

Water splashes and condenses on the base of the humidifier, creating a damp environment where mold thrives. Every week, unplug the unit, tip it slightly, and wipe the base and the underside of the tank with a dry cloth. Pay special attention to any grooves or seams where water pools.

If you see black spots or a musty smell coming from the base, mold is already growing. Wipe the affected area with a cloth dampened in equal parts white vinegar and water, then dry thoroughly. Do not submerge the base or motor housing in water—only the tank and removable parts should be rinsed under running water.

Replace or clean the filter cartridge

Dyson humidifiers use a filter cartridge that traps minerals and particles. Whether yours is washable or disposable depends on your model—check your manual or the cartridge itself for instructions. Washable cartridges should be rinsed under cool running water once a week and allowed to air-dry completely before reinserting. Do not wring or squeeze them.

Disposable cartridges typically last 4 to 8 weeks depending on water hardness and how often you run the unit. If mist output drops noticeably or the cartridge looks discolored, replace it with a new one. A clogged filter forces the motor to work harder and can reduce the humidifier's lifespan.

Run a vinegar cycle monthly for hard water areas

If you have hard water (visible mineral deposits build up quickly), run a cleaning cycle once a month. Fill the tank with equal parts white vinegar and water, reassemble the humidifier, and let it run for 10 minutes in a sink or bathtub. This flushes vinegar through the internal passages and dissolves mineral buildup before it hardens.

After the cycle, empty the tank, rinse it thoroughly, refill with fresh water, and run the humidifier for another 5 minutes to rinse out any vinegar smell. Do not leave vinegar solution in the tank between uses—it can corrode internal parts over time.

Check for mold and musty odors

A musty or sour smell means mold or bacteria is growing inside. Unplug the unit and inspect the tank interior, the base, and the filter cartridge for black or green spots. If you find mold, soak the affected parts in equal parts white vinegar and water for 30 minutes, scrub gently, and rinse well.

For the internal passages you cannot reach, run a full vinegar cycle as described above. If the smell persists after cleaning, the filter cartridge may be contaminated—replace it. Mold growth usually means the humidifier is running in a very humid room or the tank is not being emptied and dried between uses.

Store the humidifier properly during off-season

Before storing your Dyson humidifier for weeks or months, empty the tank completely and let all parts air-dry. Do not store it with water inside, as stagnant water will grow mold and bacteria that are difficult to clean out later. Wipe the base and tank dry with a cloth, and store the unit in a cool, dry place away from direct sunlight.

When you take it out of storage, rinse the tank and filter cartridge again before using, even if it has been sealed. Dust can settle inside during storage, and a quick rinse ensures the first mist is clean.

Frequently Asked Questions

Can I use bleach to clean my Dyson humidifier?

No. Bleach can damage plastic parts and leave toxic residue that mixes with the mist you breathe. White vinegar and water is the safe, effective alternative for mineral buildup and mold. Rinse thoroughly after any vinegar cleaning.

How often should I replace the filter cartridge?

Disposable cartridges typically last 4 to 8 weeks depending on water hardness and daily use. Washable cartridges should be rinsed weekly and replaced when they no longer rinse clean or look discolored. Check your manual for your specific model's recommendations.

Why does my humidifier smell musty even after cleaning?

Musty smells usually mean mold is growing in the filter cartridge or internal passages. Replace the cartridge and run a vinegar cycle through the unit. If the smell returns quickly, the room may be too humid—try running the humidifier for shorter periods or in a less damp space.

What if mineral buildup is so heavy the nozzle won't unclog?

Soak the nozzle in vinegar solution overnight instead of 30 minutes, then try again with a pipe cleaner. If it is still blocked, the nozzle may need replacement—contact Dyson support or check if your model has a replacement nozzle available for purchase.

Can I use distilled water to avoid mineral buildup?

Yes. Distilled water has no minerals, so it dramatically reduces white crusty deposits and extends the time between deep cleanings. If you have hard water and run the humidifier frequently, using distilled water is worth the small extra cost to keep the unit cleaner longer.