Unplug your Venta humidifier from the wall outlet. Dampen a cloth and wipe down the outside of the humidifier with the cloth to remove any dust or dirt.
Lift the water storage unit from the humidifier's motor and open the lid. Pour out any water and wipe the inside of the water storage unit with the damp cloth.
Remove the cleaning brush from its storage place under the water storage unit. Scrub the mineral deposits off the water sensor and the oscillator. Rinse the inside of the tank out with clean water to remove any mineral bits.
Fill the tank with clean water and place it on the Venta humidifier's base.