WISP Window Cleaner VacuumWISP window vacuum makes cleaning easy and fun. Compact and lightweight design for easy maneuverability. Separate clean and dirty cleaner fluid chambers, with easy to empty tank. Best window cleaner for outside, inside, cars, glass doors, windows, and so much more! Simply spray liquid, gently scrub with padded side to remove dirty, then flip over and use the window squeegee and vacuum up remain liquid for the perfect finish.