By Krystle Henderson NBC NewsGRAND CANYON NATIONAL PARK, Ariz. —
Ever wonder how the underneath of the Grand Canyon Skywalk is cleaned?
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It takes a well-trained crew, a lot of rope — and no fear of heights.
"Well, it's definitely a once-in-a-lifetime experience. Not every day you get to hang off the Grand Canyon," said Michael Duran, a rope access technician and project manager for Abseilon USA, a company specializing in this kind of work.