You won't believe how unique and simple it now is to wipe off sticker residue from your windows. Chances are you already have this item in your house!
WD-40 works the same way.
And a lot safer! Listen to him cough
I've used WD-40 for so many different applications, it can even be used for starting fluid on diesel engines. I wouldn't try it on gasoline engines, they require too high octane rating fluid. I've never damaged a 'glow plug' with it either. Take care.