(Photo Credit: Abseilon USA)

Spring cleaning has been taken to an extreme level.

Workers dangling from ropes 4,000 feet above the Grand Canyon are cleaning under the glass walkway today at the Skywalk.

The horseshoe-shaped bridge, which has a steel frame and a glass floor, extends 70 feet from the rim of the canyon, giving visitors a breathtaking view of the landscape.

Kenneth Piposar, vice president of Phoenix-based Abseilon USA, which has taken on the daring task, called the job a "great photo opportunity."

"It is the thrill of a lifetime to look down and see a person suspended by two ropes at that height with the Grand Canyon just below them," he said in a statement.

The Skywalk is located about 250 miles from Phoenix.