Because of user's apathy and carelessness, it is difficult to keep the public places (such as school practical rooms) clean. In this study, we presented a six sigma project to improve the level of cleanliness of a university laboratory. We applied the DMAIC (define, measure, analyze, improve, and control) procedure which is the general methodology of the six sigma project. In the process of DMAIC, we listened to the VOC, quantified the level of cleanliness as the level of sigma, and performed various activities to improve user's consciousness level. As a result of the project execution, cleanliness satisfaction has been increased about more than three times. It is expected that results of the proposed case study can be applied to other public places. Also, this study showed the academy campus can be used as a good place for the practical six sigma education.