Care & Maintenance Make sure the purifier is turned off and unplugged. Use a vacuum cleaner or a soft cloth to remove any dust from the air inlets or the filter compartment, so as to ensure optimal ventilation and purification. Cleaning the filter compartment Cleaning the laser particle sensor The latch of the particle sensor's cover is located just above the inside of the filter compartment. Remove the cover, by pushing a finger up against the latch (as shown in Illustration A). Use an air blow gun or a hair dryer to clean the cover and the sensor (as shown in Illustration B). Illustration A Note: Do not use hot air. Illustration B 8