Just a heads up... I've seen a few hot rod shows on powerblock Sunday... Where a line was scored with a glass cutting tool, an equivalent to lighter fluid was doused onto the glass, and then set on fire. He let it sit for just a few seconds and then began to pry the glass in a folding manner, back and forth (or up and down). Said he'd be doing it for years. They chopped an old truck, so maybe it was "trucks" and you can find the episode and order it.
Side note: seems like a PITA with the rear defroster. Too tedious for me.