How Do I Clean the Lime Scale Out of a Humidifier?


Humidifiers distribute a fine mist of moisture into the air to help relieve physical ailments, preserve wood furniture and reduce static electricity. They require proper maintenance for functionality and health purposes. Minerals in hard water can cause crusty, white lime scale deposits to form on the interior surfaces of humidifier tanks. Lime scale promotes bacteria and fungi growth within humidifiers, which can cause lung problems, infections and flu-like symptoms if inhaled. Cleaning humidifier tanks every three days prevents lime scale from developing and prevents illnesses. You can promptly clean lime scale out of a humidifier using hydrogen peroxide and elbow grease.

Things You'll Need

  • Clean toothbrush
  • 1/2 cup hydrogen peroxide
  • Water
  • Clean towel
  • Unplug the humidifier from the outlet. Remove the tank according to the directions outlined in the owner’s manual.

  • Pour the existing water out of the humidifier tank.

  • Scrub the bottom and sides of the tank with a clean toothbrush to remove crusty lime scale buildup and calcium deposits. Remove as much grime as possible.

  • Pour 1/2 cup of hydrogen peroxide and 1 cup of water into the tank. Scrub all interior surfaces of the tank with the solution, using the toothbrush. Loosen any remaining lime scale from the tank.

  • Rinse the tank several times with fresh water to wash out the hydrogen peroxide and loosened lime scale deposits.

  • Wipe the interior and exterior surfaces of the tank with a clean towel until dry. Replace the tank on the humidifier according to the directions outlined in the owner’s manual.

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