Always follow the manufacturer’s recommendations regarding the cleaning schedule for your humidifier. The right cleaning schedule will often depend on how much your humidifier operates and the quality of the water used. It is best to check the humidifier often to make sure you are not experiencing any mineral or other build-up that could negatively affect the operation of the humidifier.
A good rule of thumb: Clean it monthly with bleach. Click here to see how to clean your humidifier