Generic disconnect and power off the unit; fill the tank with 1 cup of water and 1 cup of bleach or undiluted white vinegar, screw cap back on and let sit about 20 minutes, then shake to remove residue; pour a generous amount of undiluted white vinegar into the base and let sit 20 minutes (do not submerge the base); gently scrub with a soft bristle brush or soft cloth, avoiding scrubbing the transducer; rinse thoroughly. If a vinegar or bleach smell remains, rinse with 1 tablespoon hydrogen peroxide and 1 cup water. Clean at least once per week and dry all components before storing. Air Humidifiers