Empty and Rinse the Water Tank Weekly
The water tank is where mineral buildup and mold grow fastest, so empty it completely at least once a week—more often if you live in a hard-water area. Unplug the humidifier first, then twist or lift the tank away from the base depending on your model. Pour out any remaining water into a sink.
Rinse the inside of the tank with plain tap water, using your hand or a soft cloth to wipe the walls. Do not use a brush with stiff bristles, as it can scratch the plastic. If you see white, chalky deposits (mineral scale), fill the tank halfway with equal parts white vinegar and distilled water, let it sit for 30 minutes, then scrub gently and rinse thoroughly with fresh water until the vinegar smell is gone.
Key Takeaways
- Empty and rinse the water tank every week to prevent mineral buildup and mold growth inside the reservoir.
- Clean the mist outlet and air inlet vents with a soft, damp cloth every few days to keep mist output steady.
- Soak the wick or filter in distilled water for 15 minutes if your model has one, and replace it every one to three months depending on water hardness.
- Use distilled water instead of tap water to dramatically reduce mineral deposits and extend the time between deep cleanings.
- Never submerge the motor base or use harsh chemicals—stick to white vinegar and water for all internal parts.
Clean the Mist Outlet and Air Vents
The mist outlet nozzle and air inlet vents collect dust and mineral residue, which blocks airflow and weakens mist output. Check these areas every two to three days. Unplug the unit, then use a soft, damp cloth—not dripping wet—to wipe around the outlet where mist emerges and the intake vents on the sides or back of the base.
If mineral deposits have hardened around the outlet, dampen the cloth with a 50/50 mix of white vinegar and distilled water, hold it against the spot for one minute to soften the buildup, then wipe it away. Do not poke into the nozzle with a toothpick or sharp object, as you can damage the internal spray mechanism. If mist output stays weak after cleaning, the wick or filter inside may need replacement.
Soak or Replace the Wick or Filter
Most Blueair humidifiers use a wick or filter that absorbs water and releases it into the air. Over time, minerals clog the fibers and reduce output. Check your model's manual to see whether yours has a replaceable wick or filter—the location and shape vary. If it is removable, take it out once a week and soak it in a bowl of distilled water for 15 minutes to flush out mineral deposits, then gently squeeze out excess water and let it air-dry before reinstalling.
Replace the wick or filter every one to three months, depending on your water hardness. If you live in a hard-water area or notice white dust around the humidifier, replace it every month. Blueair sells replacement wicks and filters under specific model numbers—check your manual or the product label on the base to order the correct part. A clogged wick is the most common reason mist output drops, so replacing it often solves the problem faster than cleaning.
Deep Clean the Base with Vinegar
Once a month, do a deeper clean of the base and internal passages where water sits. Unplug the unit and remove the water tank. Mix equal parts white vinegar and distilled water in a bowl. Dip a soft cloth into the mixture and wipe the inside of the base where the tank sits, paying attention to any grooves or channels where water collects.
If your model has a removable water distribution tray or channel, take it out and soak it in the vinegar solution for 20 minutes, then scrub gently with a soft cloth and rinse well. Do not pour vinegar solution directly into the motor base or submerge any electrical parts. After wiping, run plain distilled water through the system once by filling the tank and running it for 30 seconds, then emptying it, to rinse away any vinegar residue.
Use Distilled Water to Reduce Cleaning Frequency
The single biggest factor in how often you need to clean is the water you use. Tap water contains minerals like calcium and magnesium that build up as white, chalky deposits inside the tank and on the wick. Distilled water has these minerals removed, so it produces far less scale. If you switch to distilled water, you can extend the time between deep cleanings from one month to two or three months.
Distilled water costs a few dollars per gallon at any grocery store and is worth the expense if you use your humidifier daily. You do not need to use distilled water for the initial rinse—tap water is fine for that—but fill the tank with distilled water before running it. Some people use a mix of 80% tap water and 20% distilled water as a compromise, which still cuts mineral buildup significantly.
What Not to Do When Cleaning
Never submerge the motor base, power cord, or any electrical component in water. Never use bleach, hydrogen peroxide, or commercial descaling products unless your manual specifically names them—most Blueair models warn against these chemicals because they can damage plastic parts or leave residue that gets into the mist. Do not use a dishwasher to clean the tank or removable parts, as high heat can warp plastic.
Do not use a stiff brush or abrasive scrubber on the tank interior, as scratches trap bacteria and mineral deposits. Do not let the humidifier run dry—always check that the tank has water before turning it on, because running without water can damage the wick and motor. If you notice a musty or moldy smell coming from the mist, stop using it when ready, empty the tank, and soak all removable parts in the vinegar solution for one hour before reassembling.
Frequently Asked Questions
Can I use tap water in my Blueair humidifier?
Yes, tap water is safe to use, but it will cause mineral buildup faster than distilled water. If you use tap water, plan to deep clean the tank and wick every two to three weeks. Distilled water reduces this to once a month or longer, so it is worth the small extra cost if you run the humidifier daily.
How do I know if the wick needs to be replaced?
If mist output drops noticeably even after you have cleaned the outlet and vents, the wick is likely clogged. You can also remove it and look for thick white or brown deposits coating the fibers. If soaking it in distilled water for 15 minutes does not restore output, replace it with a new one.
What should I do if there is a musty smell coming from the humidifier?
A musty smell means mold or bacteria is growing inside. Stop using it, empty the tank completely, and soak all removable parts in a 50/50 white vinegar and distilled water solution for one hour. Rinse everything thoroughly, let parts air-dry completely before reassembling, and refill with fresh distilled water before running it again.
Can I use vinegar to clean the inside of the motor base?
No—never pour vinegar or any liquid directly into the motor base. You can use a damp cloth with vinegar solution to wipe the outside and the water distribution tray, but keep liquid away from electrical parts. If mineral buildup is severe inside the base, contact Blueair support for guidance.
How often should I replace the wick or filter?
Replace it every one to three months depending on water hardness and how often you use the humidifier. If you live in a hard-water area or use it daily, replace monthly. If you use distilled water and run it a few times a week, every three months is usually enough.