Prestone De-Icer Washer Fluid: * High methanol content ensures strong ice melting power and the addition of ethylene glycol helps prevent dangerous re-freeze * Prestone"s Dirt Blocker technology coats windshields with a resilient organo-modified siloxane copolymer * This formulation imparts a durable, hydrophobic shield, preventing road spray from adhering to glass and moving dirt particles quickly into the washer fluid as it beads and rolls away