What Exactly is a Window Cleaner?

It's blue, it's in a spray bottle, it's mostly water, blue dye, and ammonia (with a little detergent thrown in). Is that your idea of a window cleaner? Read Wickipedia's defination. It may just surprise you that traditional window cleaning methods don't really remove dirt from windows. If you get your window cleaner from a bottle, you may just be smearing windows by relocating the dirt.