At ServiceMaster Guaranteed Commercial Cleaning weve been providing Portland area businesses janitorial cleaning and building maintenance services since 1973. By focusing on our customer’s unique needs, weve grown right along with them. Providing janitorial services to hundreds of metro area businesses and managers each year has made us the experts in Portland. Our ServiceMaster Clean® Franchise is the oldest in Portland. For over 38 years, we have been serving customers large and small. We have grown our business through strong relationships focusing on the specific needs of our customers. We are proud to say that some of our customers have been with us for over 30 years!