Nationwide Janitorial Service is a family-owned company that was founded in 1974. It offers a range of janitorial solutions for clients throughout the United States. The company provides commercial, industrial, office, carpet and ceiling cleaning services. Nationwide Janitorial Service also offers floor refinishing, window washing and construction cleanup solutions. The company additionally administers an environment friendly cleaning program that utilizes chemicals that are approved as part of the Green Seal certification program.. Window Cleaning