To do so, use a bottle brush or another tool that can gently remove the buildup. Never use sharp objects to clean a humidifier, as that could damage it. After any cleaning, rinse the device thoroughly with tap water and dry out completely to make sure that no particles or vinegar are left behind.

The ultrasonic frequencies that an ultrasonic humidifier generates are not dangerous to humans and pose no health risk to the user. However, because ultrasonic humidifiers do not use heat to nebulize the water, water contaminants can be projected into the air, which the user breathes in.

An ultrasonic humidifier uses a ceramic diaphragm vibrating at an ultrasonic frequency to create water droplets that silently exit the humidifier in the form of cool fog. Usually the mist gets forced out by a tiny fan, while some ultra mini models have no fans.