Car-Chem Pre-Icer is a preventative glass treatment for cold weather. It is sprayed onto clean, dry glass before a frost to form an initial barrier that helps stop ice settling on the treated area. Car-Chem's method is simple: spray a generous covering, do not wipe it off the glass, and wipe any excess from the paintwork. After freezing, the wipers and screen wash clear the excess product and traces of ice, while windows without wiper blades are cleared with a rubber squeegee. It suits drivers who park outside through the winter months. Keep a winter screen wash, a squeegee and an ice scraper alongside it.