... and electrical equipment: The anhydrous alcohol to combine ultrasonic cleaning implement can be make use of washes precise ... glasses , watch chain ,pen , CD, shave palpus knife , comb , toothbrush , artificial tooth , tea set etc. And milk bottle ,milk chews ... all the problems.5.Clock and watch , precision instrument: Have ultrasonic cleaner ,you shouldnt Dismount screw , gear wheel , hairspring ...