How often do I need to clean a humidifier?

Clean the tank every 3 days and do a deep clean weekly. Stagnant water breeds bacteria and mold within 48 hours, and the humidifier then disperses those contaminants into the air you breathe. Empty the tank, wipe it with white vinegar, rinse thoroughly, and air dry. For the base and any wicking filters, follow the manufacturer's schedule. Neglecting cleaning can worsen respiratory symptoms rather than improve them.