Here's a bit about it:
Window cleaner history
In the twentieth century, window cleaners began using the Chicago squeegee, a bulky tool with two heavy pink rubber blades. Changing the blades required the loosening of twelve separate screws. The modern single-blade window cleaning squeegee was patented by Ettore Steccone in 1936; it was lightweight brass with a very flexible and sharp rubber blade. The Ettore Products Co. is still the leader in the squeegee market today.[1]
During the September 11, 2001 attacks, window washer Jan Demczur used a squeegee to free himself and five others from an elevator shaft in the World Trade Center. [2]
According to Guinness World Records, the world's fastest window cleaner is Jason Hughey of South Ockendon, Essex, England, who cleaned three standard 45-inch x 45-inch office windows set in a frame in 9.24 seconds at the National Exhibition Centre in Birmingham in March 2005. He used an 11.8-inch squeegee and 2.4 gallons of water.[3]