Office Cleaning and Commercial Janitorial Services serving Metro Milwaukee, Wisconsin. 3rd Millennium Cleaning has earned the reputation as an accredited janitorial cleaning company with over 20 years of commitment to the Metro Milwaukee area. We only specialize in Class A commercial cleaning service, cleaning corporate offices, high end commercial, retail, industrial and manufacturing facilities. 98.8% Client retention rate over past 20 years 2019, 2018, 2016, 2014, 2012, 2011, 2010, 2007, 2003 Milwaukee Janitorial Firm of the Year (US Facilities Market Research) Employ the highest quality Green cleaning products Class A quality performance standards Locally owned and managed in Milwaukee