In 1924, George Gershwin wrote Rhapsody In Blue, the first round-the-world-flight took 175 days, and the Harry F. Carlson Company cleaned its first window. Today, music might be louder and planes might be faster, but the technicians at Carlson still offer the same commercial cleaning and residential window services that earned them business all those years ago. That's not to say they haven't adapted with the time, though. Armed with environmentally-conscious cleaners and high-tech equipment, technicians bust dirt in offices, factories, and commercials spaces 24 hours a day. That same gear also helps them keep residential windows shining without streaks or spots.