Originally published Tuesday, June 5, 2018 at 10:33a.m.

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Cleaners pause for a selfie while hanging far above the canyon floor. (Photo/Abseilon USA)

With tens of thousands of visitors per year, the Grand Canyon Skywalk’s glass walls collect millions of finger and footprints. Abseilon USA, a company that specializes in cleaning hard-to-reach locations like skyscrapers and bridges, cleaned the glass walkway while visitors watched. (Photos/Abseilon USA)

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