Cleans road crud off a windshield, too. ("Windscreen" for our non-Engish speaking pards from Great Britain and down under.)
Actually it's really very good for you. Sorta like de-leading and cleaning a gun barrel. Polishes up your innards so they shine like new penny. The doc can shine a light down your throat while you say "AHHHH", and the nurse can stand behind you and make shadow puppets on the wall.