WOW: Crews clean St. Louis Gateway Arch (VIDEO)

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ST. LOUIS, Mo. - It's a nerve-wracking job, but somebody has to do it!  The nation's tallest monument, the St. Louis Gateway Arch, needs to stay clean.

The U.S. National Park Service released video of crews scaling the arch to clean it and collect samples of discoloration for a corrosion study.

The Gateway Arch is about 630 feet above the city of St. Louis, Missouri.