Empty and rinse the tank weekly

The water tank is where bacteria and mineral buildup start. Once a week, unplug the humidifier, remove the tank from the base, and pour out any remaining water. Rinse the inside with warm tap water, rubbing the walls with your hand or a soft cloth to loosen sediment. Do not use soap — it leaves residue that the humidifier can spray into the air.

If you see white or gray crusty deposits (mineral scale from hard water), fill the tank halfway with equal parts white vinegar and warm water. Let it sit for 30 minutes, then scrub with a soft brush or cloth and rinse thoroughly under running water until the vinegar smell is gone. Repeat if scale remains.

Key Takeaways

  • Empty and rinse the water tank every week to prevent bacterial growth and mineral buildup.
  • Soak the tank in a 50/50 vinegar and water solution for 30 minutes if white mineral deposits appear.
  • Clean the base and mist outlet with a damp cloth weekly, and wipe the filter or wick if your model has one.
  • Use distilled water instead of tap water to slow mineral scale and reduce cleaning frequency.
  • Never submerge the motor base or use soap, bleach, or abrasive scrubbers on any part.

Clean the base and mist outlet

The base of the humidifier can collect mineral dust and mold. Unplug the unit and wipe the base, vents, and the outlet where mist comes out with a damp cloth. Pay attention to any grooves or seams where water can pool. Let everything air-dry before reassembling.

If mist output has slowed or stopped, the outlet nozzle may be clogged with mineral buildup. Dip a cotton swab in vinegar and clean inside the nozzle opening. For stubborn blockages, soak a cloth in vinegar, wrap it around the nozzle, and leave it for 15 minutes, then wipe clean.

Replace or clean the filter or wick

Some Walgreens humidifiers use a replaceable filter or wick that absorbs water and releases it as mist. Check your model's manual to see if yours has one. If it does, remove it weekly and rinse under warm running water. Gently squeeze out excess water but do not wring it.

If the filter or wick is discolored, stained, or smells musty after rinsing, it needs to be replaced. Walgreens sells replacement filters and wicks for most of their humidifier models — check the model number on the back of your unit and search for the matching part number online or in-store. A new filter typically costs between $10 and $20 and lasts two to three months with weekly cleaning.

Descale the humidifier monthly

Once a month, do a deeper clean to remove mineral scale that builds up inside the tank and base. Fill the tank with a 50/50 mixture of white vinegar and distilled water. Reassemble the humidifier and run it for 10 minutes over a sink or bathtub so the vinegar solution flows through the system. Then unplug it, empty the tank, and rinse all parts thoroughly with distilled water.

If your area has very hard water (lots of minerals in tap water), descale every two weeks instead. You can also prevent scale by filling the tank with distilled water instead of tap water — it costs a few dollars per gallon and cuts cleaning time in half because there are no minerals to build up.

Prevent mold and bacteria growth between uses

If you turn off the humidifier for more than a day, empty the tank completely. Standing water breeds mold and bacteria quickly, especially in warm rooms. Wipe the inside of the tank dry with a cloth and leave the tank and base uncovered so they air-dry fully before you store them.

When you are ready to use the humidifier again, rinse the tank and base with fresh water before filling. If the humidifier sat unused for more than a week, do a vinegar soak of the tank before use to kill any mold spores that may have started growing.

What to avoid when cleaning

Never submerge the motor base or plug in water. Never use bleach, which can damage plastic and leave toxic fumes in the mist. Do not use abrasive scrubbers, scouring pads, or steel wool — they scratch the plastic tank and can create cracks that leak. Do not use soap or detergent, which leave a film that the humidifier sprays into the air.

Avoid using tap water if you live in a hard-water area — the mineral content will clog the nozzle and require frequent cleaning. If you must use tap water, descale every two weeks. Some people add essential oils or scented liquids to humidifiers, but Walgreens humidifiers are not designed for this and oils can clog the filter and damage the motor.

Frequently Asked Questions

How often should I clean my Walgreens humidifier?

Empty and rinse the tank every week. Clean the base and mist outlet weekly as well. Do a full vinegar descale once a month, or every two weeks if you have hard tap water. If you use distilled water, you can extend descaling to every six weeks.

Can I use bleach to kill mold in my humidifier?

No. Bleach damages plastic and leaves toxic fumes that the humidifier will spray into the air. Use white vinegar instead — it kills mold and bacteria and is safe to breathe. Soak the tank in a 50/50 vinegar and water solution for 30 minutes, then rinse thoroughly.

Why is my humidifier not producing mist?

The mist outlet is likely clogged with mineral scale. Dip a cotton swab in vinegar and clean inside the nozzle. If the filter or wick is discolored or stained, it may need to be replaced. Check your model number and order a new filter from Walgreens or the manufacturer.

Is distilled water worth buying for my humidifier?

Yes, if you have hard tap water. Distilled water costs a few dollars per gallon and cuts mineral buildup by about 80 percent, which means less frequent cleaning and longer filter life. If you have soft tap water or do not mind cleaning every two weeks, tap water is fine.

What should I do if my humidifier smells musty?

Empty the tank, rinse it, and soak it in a 50/50 vinegar and water solution for 30 minutes. Clean the filter or wick if your model has one. If the smell persists after cleaning, the filter may need to be replaced. Always empty the tank if the humidifier will sit unused for more than a day.