To keep your humidifier working efficiently for as long as possible, we recommend cleaning it once every couple of weeks during any season when you’re using it. To clean a flow-through humidifier, follow these steps: Take the base off and remove the water inside Pour in a cup of white vinegar or cleaning solution, then let it soak for an hour Scrub the inside with a soft-bristled brush To disinfect your humidifier after cleaning it, use a solution of cold water and bleach, then rinse the unit out with water and let it dry fully before turning it on again. This process will prevent bacteria or mold growth from compromising your humidifier’s effectiveness.