With the development of lens coating technology and increasing demands of optical lenses, the cleaning work for glass lenses becomes more and more important. Cleaning objects include polishing slurry, binder, protective materials and oil, glass powder after grinding. Sometimes, after many times of strict cleaning processes, optical lenses will get dirty again due to hand print, dust, saliva in the following steps such as processing or transportation, directly affects the quality of the next coating procedure. Generally, it's easier to accomplish the cleaning work via ultrasonic method. However, good knowledge of complete ultrasonic cleaning processes including dewatering and drying after cleaning system, is more critical for high-precision requirements on lense coating.