Empty and rinse the tank weekly
The water tank is where bacteria and mineral buildup start. Every week, or whenever the tank runs empty, unplug the humidifier and remove the tank by twisting or unclipping it from the base — the method depends on your Vicks model, but the manual will show you which. Dump out any remaining water.
Rinse the inside of the tank under running tap water. Use your hand or a soft cloth to wipe the interior walls. Do not use a brush or scrubber on the tank itself, as this can scratch the plastic. If you see white or tan mineral deposits (calcium buildup from hard water), soak the tank in equal parts white vinegar and water for 30 minutes, then scrub gently with a soft cloth and rinse thoroughly.
Refill the tank with fresh water before reattaching it to the base. Never run a humidifier with old water sitting in the tank between uses.
Key Takeaways
- Empty and rinse the water tank every week, or soak it in vinegar and water if mineral deposits appear.
- Clean the base unit and mist outlet with a damp cloth weekly to prevent mold and bacteria buildup.
- Replace the filter cartridge or wick every 30 to 60 days, depending on water hardness and how often you run the unit.
- Use distilled water instead of tap water to slow mineral buildup and reduce cleaning frequency.
- Never submerge the base unit or motor in water — only wipe the exterior and accessible parts with a damp cloth.
Wipe down the base and mist outlet
The base unit houses the motor and heating element, so it cannot go in water. Unplug the humidifier and let it cool for at least 30 minutes if it has been running. Use a damp cloth — not dripping wet, just damp — to wipe the exterior of the base, the mist outlet opening, and any vents or slots on the sides.
Pay special attention to the mist outlet, where moisture and mineral deposits collect. Wipe inside the opening gently with a damp cloth wrapped around your finger or a soft brush. If mineral buildup is thick, dampen the cloth with white vinegar and wipe again, then follow with a cloth dampened in plain water to rinse away the vinegar.
Do not pour water into the base or submerge any part of it. Water inside the motor or heating element will damage the unit permanently.
Replace the filter or wick cartridge on schedule
Vicks humidifiers use either a filter cartridge or a wick to absorb water and release moisture into the air. Both trap minerals and bacteria over time and must be replaced, not just rinsed. Check your manual to see which type your model uses and where it sits — usually inside the tank or in a slot on the base.
Replace the cartridge or wick every 30 to 60 days, depending on how hard your water is and how often you run the unit. If you use tap water with high mineral content, replace it every 30 days. If you use distilled water, you may stretch it to 60 days. A clogged or discolored cartridge reduces mist output and can harbor mold, so do not wait until it stops working.
Vicks sells replacement cartridges and wicks under model-specific part numbers. Check the model number on your humidifier (usually on the bottom or back) and order the correct replacement from a pharmacy, hardware store, or online retailer.
Descale mineral buildup with vinegar
Hard water leaves white or tan crusty deposits inside the tank and around the mist outlet. These deposits slow water flow and make the humidifier less effective. If rinsing alone does not remove them, soak the tank in a 50/50 mix of white vinegar and water for 30 minutes to an hour.
For the base unit, you cannot soak it, but you can use a vinegar-dampened cloth to wipe mineral deposits from the mist outlet and any exposed surfaces. Let the vinegar sit for a few minutes, then wipe with a cloth dampened in plain water to rinse. Repeat if needed.
After descaling, run the humidifier with distilled water for one full cycle to flush out any vinegar smell. Do not use the humidifier while vinegar is still inside.
Use distilled water to reduce cleaning frequency
Tap water contains minerals that build up inside the tank and clog the filter. Distilled water has these minerals removed, so it produces far less buildup. If you switch to distilled water, you will rinse the tank less often and replace the filter cartridge less frequently.
Distilled water costs a few dollars per gallon at any pharmacy or grocery store. For a humidifier that runs eight hours a day, one gallon lasts about two weeks. The cost of distilled water is usually less than the cost of replacing filters more often, so it is worth the trade-off if your tap water is visibly hard.
Even with distilled water, still rinse the tank weekly and replace the filter on schedule. Distilled water slows buildup but does not stop it entirely.
Store the humidifier properly during off-season
If you stop using the humidifier for weeks or months, drain it completely and let it dry. Empty the tank, wipe the base and mist outlet with a dry cloth, and leave the unit unplugged in a dry place. Do not store it with water inside, as stagnant water breeds mold and bacteria that will smell when you turn it back on.
Before you use the humidifier again after storage, rinse the tank, replace the filter cartridge if it has been sitting for more than a month, and run it for one cycle with distilled water before using it in a bedroom or around children.
Frequently Asked Questions
Can I use bleach to clean my Vicks humidifier?
No. Bleach can damage plastic parts and leave toxic residue that gets into the mist. Use white vinegar and water instead for mineral deposits, or plain water for routine cleaning. Vinegar is safe, effective, and will not harm the humidifier or the air you breathe.
Why does my humidifier smell bad even after I clean it?
Stale water or a clogged filter cartridge causes odor. Empty the tank completely after each use, rinse it, and refill with fresh water. If the smell persists, replace the filter cartridge — a worn cartridge traps bacteria that no amount of rinsing will remove. Also check that you are not storing the humidifier with water inside it.
How do I know if the filter cartridge needs replacing?
Replace it every 30 to 60 days regardless of appearance. If the mist output drops, the cartridge is clogged. If you see dark spots or discoloration, the cartridge has trapped bacteria and should come out when ready. Do not wait for visible signs if you have been using the humidifier daily for two months.
Is it safe to use tap water in a Vicks humidifier?
Yes, but it requires more frequent cleaning. Tap water leaves mineral deposits that clog the filter and reduce mist output. If your water is hard, you will clean the tank and replace the filter more often. Distilled water is gentler on the humidifier and costs less over time than frequent filter replacements.
What should I do if water leaks from the base?
Unplug the humidifier when ready and let it dry. Check that the tank is seated properly on the base — a loose tank is the most common cause of leaks. If the tank is find and water still leaks, the seal between the tank and base may be worn. Consult your manual for the model-specific seal replacement, or contact Vicks customer service for guidance on repair or replacement.