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Laser cleaning is an environmentally friendly, stable and reliable cleaning method and has no mechanical contact. Laser cleaning also has high efficiency, low cost and other unique advantages, so can be used widely in many engineering applications of accurate positioning and online cleaning. The laser direct cleaning and laser-induced plasma shockwave (LIPS) cleaning were utilized to remove the dust particles on the surface of K9 glass. The laser cleaning effect was studied by using optical microscopy, spectrophotometer, and image analysis. The results showed that the particles on K9 glass surface were cleaned effectively, except some of the tiny particles. Under high laser fluency irradiation, laser-induced damage was found on the K9 glass surface. The LIPS cleaning achieved better cleaning effect and has no substrate damage. When the distance between the laser-induced plasma and the sample surface was about 1 mm, the contaminated K9 glass surface was cleaned by the LIPS cleaning with 10 pulses irradiation at laser wavelength of 1 064 nm, and laser energy of 70.7 mj. After the LIPS cleaning, the 355 nm laser-induced damage threshold of the K9 glass surface was improved from 5. 8 J/cm2 to 8. 0 J/cm2, and was similar to that of the substrate threshold ( 8. 5 J/cm2 @ 50% damage probability). This study is helpful to make clear the laser cleaning mechanism and to develop the laser cleaning application, as well as to increase the innovation and exploration in the experimental teaching. [ABSTRACT FROM AUTHOR]