state the two types of glass normally used on modern vehicles
Windshield The windshield (North America) or windscreen (EU and most Commonwealth countries) of an aircraft, car, bus, motorbike or tram is the front window. Modern windshields are generally made of laminated safety glass, a type of treated glass, which consists of two (typically) curved sheets of glass with a plastic layer laminated between them for safety, and are bonded into the window frame. Motorbike windshields are often made of high-impact polycarbonate or acrylic plastic.
Windshield washer fluid Consumer advocacy groups and auto enthusiasts[who?] believe that the alcohols and solvents present in some, but not all, windshield washer fluid can damage the vehicle.[citation needed] These critics point to the corrosive effects of ethanol, methanol, and other components on paint, rubber, car wax, and plastics, and groups propose various alternatives and homemade recipes[specify] to protect the finish and mechanics of the motor vehicle.