Together with the cleaner concentrate, I can clean my glasses without leaving streaks and even the smallest screws, nuts, .... be freed from deposits. The sound is a little uncomfortable when it is running, but you can also start it and walk away. This is my first ultrasonic cleaner and I buying so far no second bereut.Biopretta ultrasonic cleaner concentrate for glasses, jewelery, dental, etc. 1 liter, 1,000 ml * SPECIAL PRICE