Cleaning windows can be a frustrating job – especially without the right tools. Drying a glass window pane with a cloth is likely to leave smears, but letting the window dry naturally causes streaks. That’s why window vacs are so useful. These handheld appliances suck surfaces dry, so you don’t get ugly smears after cleaning. They make it easy to get crystal clear windows without paying a professional cleaner, and can also be useful for removing condensation.