Fun Fact about windows, the Roman Egyptians were the first to use glass windows, the word "window" comes from the Old Norse for "wind eye. Historically, windows were made from materials like animal hide or paper before glass became common and expensive, while some famous buildings have thousands of windows, like the Burj Khalifa with 34,348.  

A key window cleaning fact is that professional skyscraper window cleaning can be statistically safer than driving a cab, although it is one of the most dangerous jobs. Other facts include that the modern squeegee was patented in 1936 by Ettore Steccone, and it's better to clean windows on a cloudy day to prevent streaks from the sun heating and evaporating the cleaning solution too quickly.