Courtney Blethen, Associated Press
A Kaercher GmbH & Co. KG worker uses heated, high-pressure water to clean the surface of the Space Needle in Seattle on Thursday. The structure towers 520 feet above the city and features an observation deck with telescopes for a 360-degree panoramic view of Seattle and surrounding areas, including Mount Rainier. It also features a restaurant.

A Kaercher GmbH & Co. KG worker uses heated, high-pressure water to clean the surface of the Space Needle in Seattle on Thursday. The structure towers 520 feet above the city and features an observation deck with telescopes for a 360-degree panoramic view of Seattle and surrounding areas, including Mount Rainier. It also features a restaurant. Courtney Blethen, Associated Press