If you’re like me, you probably don’t clean your windows until you notice that they’re incredibly dirty. And maybe not even then. Did you know it’s recommended to clean them twice per year? According to This Old House, we amateur window washers hate it because the way we’re doing it is too much work — and to help us out, they’ve provided some easy, step-by-step instructions to follow that will let you clean your windows the way the pro’s do it. They’ve broken it down into 3 simple steps, with instructions for both multi-pane and picture windows, and they’ve even provided a bonus for handling extra stubborn spots.