Stickers have left residue on some windows and old glass jars. I have typically used acetone to clean the residue but is there a better / easier way?
Use a new razor blade on the windows to scrape it off (blades like the kind you use in a extractable utility knife). Angle the blade at about 30 degrees up from laying flat against the glass and move in a scraping (rather than slicing) motion - works great with paint too. The old glass jars will be more difficult because of their shape... I'd try putting them in a dish washer or possibly using Sherwin Williams 'Oops' product - Lowes sells the same thing labeled as 'Goof-Off'. You might also use the 'Oops' product to keep your razor blade clean when working on the windows.