With more than 30 years of experience in cleaning services and cleaning management, he now provides cleaning/management services for many large enterprises and large organizations. Faithful Clean is the major gaming company such as University of Science and Technology, Tourism College, Finance Bureau, Galaxy, Sands, Parisian, MGM, and many commercial buildings in the central district, such as Yongguang Plaza, AIA Plaza, and noble residences such as Ocean Sky , The world in the world. Provided cleaning services for the University of Macau for more than 10 years (2 years on the new campus), and provided cleaning services for the Macau Ren Earls General Hospital for nearly 10 years, and provided cleaning services for general health care units and the Center for Disease Control and Prevention for nearly 5 years. In 2013, customer service evaluations were mostly satisfactory or above.