Empty and disassemble the humidifier before cleaning

Start by unplugging the unit from the wall outlet. Pour out any remaining water from the tank — do not attempt to clean while the humidifier is plugged in or while water is inside. Most Homedics ultrasonic models have a removable top cap, a water tank that lifts away from the base, and a mist nozzle that unscrews or pulls straight out. Check your specific model's manual to see which parts come apart, but the general approach is the same across their product line.

Set the base unit on a towel or in a sink. The base contains the ultrasonic vibrating plate that creates the mist, and you will need to access it to remove mineral buildup. Do not submerge the base unit itself in water — only the removable tank and cap should go into water for cleaning.

Key Takeaways

  • Always unplug the humidifier and empty all water before you start cleaning, and never submerge the base unit in water.
  • Mineral deposits build up on the ultrasonic plate inside the base, and white vinegar is the most effective way to dissolve them without damaging the equipment.
  • The water tank and cap can be washed with warm soapy water, but the mist nozzle and ultrasonic plate require vinegar soaking to prevent mold and mineral clogging.
  • Let all parts air dry completely before reassembling, which usually takes 30 to 60 minutes depending on humidity in your home.

Clean the water tank and cap with warm soapy water

Fill a sink or large bowl with warm water and add a few drops of dish soap. Place the removable water tank and the top cap into the soapy water and let them soak for 5 to 10 minutes. Use a soft sponge or cloth to wipe the inside and outside of the tank, paying attention to the threads where the cap screws on — mineral deposits often collect there and can make the cap stick.

Rinse both pieces thoroughly under running water until no soap remains. Shake out excess water and set them on a clean towel to air dry. Do not use a dishwasher, as the heat can warp plastic components on some Homedics models.

Soak the mist nozzle in white vinegar

The mist nozzle is where mineral buildup causes the most visible problems — you may see white crusty deposits or notice the mist output has weakened. Fill a small cup or glass with white vinegar (standard 5% acidity is fine) and submerge the nozzle completely. Let it soak for 30 minutes to 1 hour. If the nozzle is heavily clogged, you can soak it overnight.

After soaking, use an old toothbrush or a small soft brush to gently scrub away the loosened deposits. Rinse under running water and shake out the vinegar. If you see remaining white buildup inside the nozzle opening, soak it again for another 30 minutes and repeat the brushing. Do not use a sharp object to pick at deposits, as you can crack the plastic.

Remove mineral deposits from the ultrasonic plate

The ultrasonic plate sits at the bottom of the base unit and is the most important part to keep clean — mineral buildup here stops the humidifier from producing mist. Do not submerge the entire base in water. Instead, use a cotton swab or small cloth dampened with white vinegar to wipe the plate directly. You may need to tilt or angle the base to see it clearly.

If mineral deposits are thick or stubborn, soak a cotton swab in vinegar and hold it against the plate for 1 to 2 minutes to soften the buildup, then wipe gently. For very heavy deposits, you can pour a small amount of vinegar (about 1/4 cup) directly into the base and let it sit for 15 to 20 minutes, then wipe the plate clean with a damp cloth. After vinegar treatment, wipe the plate with a cloth dampened in plain water to rinse away any remaining vinegar.

Dry all parts completely before reassembling

Lay all cleaned pieces on a clean, dry towel in a well-ventilated area. The tank, cap, and nozzle should air dry within 30 to 60 minutes depending on your home's humidity. Wipe the base unit's interior with a dry cloth to remove any remaining moisture. Do not reassemble or plug in the humidifier until every part is completely dry — moisture left inside can cause mold growth or electrical problems.

Once everything is dry, screw the nozzle back onto the base, place the water tank on top, and attach the cap. Fill the tank with fresh water and plug the unit back in. Run it for a few seconds to make sure mist flows normally before using it in your room.

How often to clean your Homedics humidifier

The cleaning schedule depends on your water hardness. If you have soft water or use distilled water, a full cleaning every two weeks is usually enough. If you have hard tap water, mineral deposits build up faster — clean the nozzle and ultrasonic plate weekly, and do a full disassembly cleaning every 7 to 10 days. You will notice the mist output weakening before the humidifier stops working entirely, so that is a good signal to clean sooner.

Between full cleanings, you can extend the time between deep cleans by emptying the tank after each use and refilling with fresh water. Never leave water sitting in the tank for more than a day, as stagnant water encourages mold and bacteria growth even if the humidifier is not running.

Common mistakes that damage Homedics humidifiers

Do not use bleach or harsh chemical cleaners on any part of the humidifier. Bleach can corrode the ultrasonic plate and damage plastic components. Do not scrub the ultrasonic plate with a hard brush or scraper — the plate is delicate and scratching it reduces its ability to vibrate and create mist. Do not use hot water on plastic parts, as it can warp the tank or cap threads.

Do not submerge the base unit or plug the humidifier back in while any part is still wet. Moisture inside the base can short the electrical components or cause rust on the metal plate. If you accidentally get water inside the base, leave it unplugged and open to air dry for at least 24 hours before attempting to use it again.

Frequently Asked Questions

Can I use distilled water instead of tap water to reduce cleaning?

Yes. Distilled water has no minerals, so it dramatically slows mineral buildup on the ultrasonic plate and nozzle. If you use distilled water, you can extend the time between cleanings to every three to four weeks. However, you still need to empty and refill the tank daily to prevent mold growth, even if you are using distilled water.

What should I do if the mist nozzle is still clogged after vinegar soaking?

Soak it again for a full hour or overnight, then try a second round of gentle brushing. If deposits remain, you can carefully use a thin wooden toothpick or bamboo skewer to gently probe the opening — never use metal, which can scratch the plastic. If the nozzle is permanently blocked, Homedics sells replacement nozzles separately, which are inexpensive and straightforward to swap out.

Is it safe to use vinegar inside the base unit?

Yes, as long as you do not submerge the entire base and you rinse and dry it thoroughly afterward. Pour only a small amount of vinegar (about 1/4 cup) directly onto the ultrasonic plate, let it sit briefly, then wipe it clean with a damp cloth and dry completely. Never leave vinegar sitting in the base for hours, and always unplug the unit before adding vinegar.

Why does my humidifier smell moldy even after cleaning?

Mold grows in stagnant water left in the tank between uses. Empty the tank completely after each use, rinse it out, and leave it open to air dry. If the smell persists after cleaning, soak the tank in a solution of one part white vinegar to three parts water for 30 minutes, then rinse and dry thoroughly. Do not use the humidifier again until the tank is completely dry.

How do I know if the ultrasonic plate is damaged?

If the humidifier produces no mist even after cleaning, or if it produces mist only intermittently, the plate may be damaged. Check that the plate is clean and dry, then fill the tank and run the humidifier for 10 seconds. If still no mist appears, the plate may need replacement — contact Homedics customer service for a replacement base unit or plate assembly.