Humidifiers tend to have hard water deposits on the bottom of the water tank and around the heating connection. I tried scrubbing this area with all sorts of materials and could never really get it clean until I found out that sprinkling citric acid over it works wonders to remove this buildup with minimal scrubbing.
Depending on the size of your humidifier, boil six to eight cups of water and take a box of citric acid powder. Remove the water tank and pour citric acid into the base enough to cover the surface. Then pour the boiling water. Add citric acid as needed to cover the affected area. Then let it rest for five minutes scrape away the debris. Repeat this process as many times as necessary, but it shouldn’t take many.
