Ice and Frost Shield is a robust formula that provides a resilient barrier between the environment and automotive glass, thus reducing the accumulation and adhesion of frost and light ice. The copolymer active ingredient imparts a balance of hydrophobic and hydrophilic characteristics, which provides durable protection without compromising visibility. The formula was developed and rigorously tested in the Prestone Research and Development laboratory in an environmental test chamber. Its performance has been confirmed in a comprehensive vehicle fleet test enduring a New England winter. Prestone Ice and Frost Shield Vehicle Glass Treatment can be used on a daily basis without altering your vehicles windshield.