Always turn the unit off, allow it to cool and unplug before cleaning. Remove the water tank and empty any excess water from the tank and base. Fill base with Holmes® Cleanse Clean® solution to remove mineral build-up. Soak for 20-30 minutes before thoroughly rinsing the base and heating element with warm water. Clean the tank by adding one teaspoon chlorine to 1 gallon of water. Let soak for 20 minutes, making sure all surfaces are wet. Rinse thoroughly until bleach has been removed and replaced with fresh water. Click here for detailed information on how to clean your humidifier.