Many people can say they work in a downtown Knoxville building, but Scott Murrin has nearly worked on them all. The 49-year-old went over the edge of Riverview Tower on Tuesday — 24 stories above the ground — with a bucket of water and Dawn dish detergent. From the ground, he appeared as just a speck alongside the building's massive BB&T sign. Keeping Knoxville buildings clean has become fairly routine for the one-man band over the past 23 years. To an outsider, it's anything but. "I've done this building since I started," he told Knox News after disconnecting from the ropes on sa...