Office Cleaning and Commercial Janitorial Service serving Metro Milwaukee, Wisconsin. 3rd Millennium Cleaning has established itself as the premier janitorial company with over 10 years of commitment to the Metro Milwaukee area. We only specialize in Class A type cleaning, providing service to prestigious corporate offices, high end commercial, retail and living facilities. Class A Service Daily Full Service Cleaning Day Porter Service Custodial Contracts Hard Surface Floor Maintenance Power Clean Detailed corner to corner