Several humidifiers are noted for their ease of cleaning: Levoit LV600S:  It's powerful, quiet, and easy to clean. This ultrasonic humidifier is designed not to over-humidify your room. Honeywell Cool Moisture Humidifier:  It scored high in design, effectiveness, and ease of setup. It is also considered easy to clean. raydrop Cool Mist Humidifier:  This unit has a large top opening, making it easy to clean. Miro NR07G:  This cool-mist humidifier is one of the easiest to clean and is highly hygienic. It can be filled and cleaned from the top. Oraimo Humidifier:  This top-filled cool mist humidifier is quiet and easy to clean. It also doubles as an essential oil diffuser.