From a small family business in 1956 to a nationwide cleaning partner, KleenMark has been growing, innovating, and delighting clients every step of the way.
Milestones That Define Us
From our founding to nationwide expansion, these are the key moments that shaped KleenMark and our commitment to excellence.
1956
Jack Stevenson bought Hoffman Brothers Bar and Restaurant Supply
1959
Renamed Hoffman Brothers Bar and Restaurant Supply to Hoffman Chemical
1961
Cleaners at IBM asked Jack to take over cleaning services
1961
Jack established DnS Janitorial to offer commercial cleaning services
1986
Scott Stevenson, Jack’s son, began working at DnS Janitorial
1998
Expanded to Oshkosh and Appleton, Wisconsin
2000
Scott Stevenson took over as owner and CEO of DnS Janitorial
2001
Reached 500 employees
2005
Scott rebranded DnS Janitorial and Hoffman Chemical to KleenMark
2006
Expanded to Milwaukee, Wisconsin
2007
KleenMark successfully obtained CIMS With Honors certification
2008
Expanded to Wausau, Wisconsin
2011
KleenMark successfully obtained CIMS Green Building With Honors certification
2015
Expanded into Minnesota and Illinois
2022
Expanded into Arizona
2023
Expanded into Pennsylvania
2023
Exceeded 1000 employees
2023
KleenMark successfully obtained CIMS Green Building Advanced by GBAC With Honors certification
