Most people probably don't think about how the Skywalk (the 70 foot horseshoe shaped glass and steel bridge 4,000 feet above the Grand Canyon) gets the glass cleaned though it has to be done twice a year. Originally a company from Phoenix would send a team who would dangle by ropes to do the job and it took 10 days. Eventually the company had a trolley attached to the underside of the rail so now it takes 2 day to clean. Skywalk remains open during these cleanings allowing the visitors to chat with the workers and one of the most frequently asked questions is what do they use to get the glass so clean? The answer is cold water and a few squirts of Dawn dish soap. That question seems somewhat anticlimactic considering the setting.
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