Quote:
Originally Posted by Flying Pencil
Aircraft "glass" is typically plastic, except for armored glass.
Plastic is easy to scratch, and would be awesome to have.
Armored windows is glass, and scratches, even nicks and spider chips, would be very unusual because rocks off of tiers do not fly up to 12,000 ft! 
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Plexiglass (PMMA=Polymethylmethacrylate) was invented by army and used for the first time for spit's cockpit (with its typical thermoformed rounded shape).
The scratches that you see in Lock on are typical of modern PMMA cockpits.
Alcohol is very aggressive for PMMA, if you want to make some scratches on PMMA you just have to clean it.
Glass scratches are different and very rare to see on old glass cockpit's thikness.
The spit is the only plane that should have this "scratches", and also different clean-cut bullet's holes