Posted By North Star.

To prevent lime deposits from building up, drop an old copper scouring pad into the water container.

Add a couple tablespoons of common bleach to your humidifier twice a week. The bleach will clean off slime and scale, kill bacteria, and make parts last longer. You can add a couple drops of fragrance to scent the bleach, if desired.

Eliminate musty odor by pouring three or four capsful of bottled lemon juice into the water.