Turn off and unplug the humidifier from the electrical outlet. Empty the water from the unit.
Use a brush to clean both the inside and the outside of the humidifier to remove all present dust. Then, use a cleanser created by mixing water with an equal amount of 3 percent hydrogen peroxide. Rinse the unit out three times with tap water before drying and refilling.
Fill the humidifier back up using bottled distilled water. The distilled water has a lower mineral content than other bottled or tap waters, lowering the creation of the scale that causes white dust on the humidifier.
Attach a demineralization cartridge to the unit following the manufacturer’s instructions to trap the minerals within the water before dispersal. This keeps the minerals from being released into the air.