The rear and side windows are made of tampered or toughened glass. Tampering is said to boost the glass’ strength by as mush as 200% to 400%—Woah!—thus decreasing the probability of breakage. However, there’s a type of tampered glass that shatters into many pieces to lessen the body injury and car damage that may be incurred in case an accident occurs. There’s also a type of tampered glass that shatters into bits, but still manage to come out in linear (and not sharp) fragments.

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.