How do I clean the transducer/ultrasonic membrane?
Clean the transducer/ultrasonic membrane with a 50/50 mix of white vinegar and water on a cotton swab, then wipe off with a damp cotton swab. Never touch the transducer/ultrasonic membrane with your fingers, as the natural oils in the skin can damage the surface. Never submerge the base in water or any other liquid.
From the official Homedics Uhe-Cmtf91 Humidifier manual, page 9
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