Washington, MO

Washington’s Trusted Source for Precision-Grade Cleaning

In 2025, 4M Building Solutions, a national leader in janitorial and facility services, expanded its presence in east-central Missouri through the acquisition of FKI Cleaning Services, a locally respected provider serving Franklin, Warren, and St. Louis counties. This strategic addition strengthens 4M’s regional footprint and reinforces its commitment to Precision-Grade Clean.

For over a decade, FKI earned a reputation for customized service, exceptional quality, and deep community roots. Founded as a family business and built with heart, FKI grew to serve more than 80 client sites with a team of 46 dedicated professionals. That same team now continues operations under the 4M banner, bringing trusted service and familiar faces to the communities they know best.

Operating from FKI’s Washington office, former co-owner Casey Thiemann now serves as a 4M District Manager, helping ensure seamless service delivery and strong local leadership. Backed by 4M’s national scale, advanced systems, and relentless commitment to quality, the team is ready to deliver even greater value to clients throughout the region.

Together, we’re building on a legacy of excellence.