/ printhead can be cleaned with ultrasonic waves? Is it washed clean? Because if these are cleaned manually on a regular basis, it is very difficult to clean them thoroughly and they may not be cleaned thoroughly enough. Some customers still don't know how to clean the ultrasonic cleaner when they get it. Should they put the whole machine in or just half of it? Kemeng tells you HP(HP) (HP)  (Epson)  (Canon)  SAMSUNG (Samsung)  (Lenovo)  (benq)  / nozzle Actual operation: