Dallas Janitorial Services has been cleaning commercial office buildings in the Dallas area for over 30 years. Our clients rely on us to provide quality janitorial services, building management, office cleaning services, facility maintenance, integrated facility management, and superb landscaping. The Best Customer Service in the Industry. While we are large enough to meet your every need, we are still able to provide you with the very special service and personal attention you expect. Our hard working, diligent team provides clients with the satisfaction of knowing that their facility is always clean and running smoothly. Our clients also know that we are available 24/7 to address any issue that may arise.