After dry, non-sticky samples are taken out directly when grinding is completed, use vacuum to clean the remaining particles, and then wash the device with water and dry. A slightly more complicated sample, such as a sticky one, can be cleaned with detergent after grinding, and then laundry powder or dish liquid mixed with water is filled to grind. When washed several times or soaked for a period of time, it can be brushed by a brush. The use of solvent depends on the material of the grinding jar and the characteristics of the grinding material. The solvents that can be used are alcohol, hydrochloric acid, acetone, butanone, etc.. Finally, after grinding for about 10 minutes, it should be cleaned and dried with alcohol. Ultrasonic cleaning is a more convenient way.