Funny you should mention this . . .
I bought a Volvo station wagon once, paid $2,000 for it, brought it home and parked it in the driveway
That night it got fairly cold so condensation formed on the windshield. The physics bods on here could probably explain how micro scratches (like what you might get from writing on the windshield with one of those white things you used to use for tennis shoes) on the surface of glass make the local interaction with condensation nuclei behave differently, but to suffice it to say, that when I came out in the morning, there, plain as daylight, on the windshield was the message . . .
. . . $1640