Windshields are usually made of laminated glass, though some of the latest models, the hatchbacks particularly, use the same material for their rear windows. The laminated glass is described as having a structure that’s like a sandwich; meaning, two glass layers bonded by an interlayer of
PVB or polyvinyl butyral under extreme heat and pressure. Since the PVB boasts of strength and ductility, this setup prevents cracked glass from further shattering into pieces.

If you’re aiming to clean your car’s windows (because you thought it would be easy), here’s one thing you should know first: the windshield, rear windows, and side windows of your car aren’t built of the same stuff. No pulling your leg here, but ye, though they’re glass, these windows differ in the type of glass and the number of glass layers used to make them.