A Brief History of Window Cleaning

(via Atlas Obscura)  For centuries, the average home had windows, but not necessarily glass covering those windows—in part, because glass was really expensive at first, and the flat pane variety that we’re used to didn’t even exist. But as glass evolved as part of the 20th-century home, it suddenly became important to keep those panes of glass clean. And that meant there was an opportunity for the Philip W. Drackett Company to come about and make it easy.