//content.invisioncic.com/y282845/emoticons/greedy.gif.5a53e6246569d7ab79867170f3b06629.gif COOLIf you want to get the tint off and not hurt the defroster lines...Do this.
Spray amonia on the tint, and and tape a plastic bag over the tint, creating a "pocket". This usually only works well in warm weather, but the amonia + Heat will "eat" the tint off of the glass, without harming the defroster.