Soak the residue with warm, soapy water
Let it sit for a few minutes
Scrape gently with a plastic scraper or old card
Apply rubbing alcohol to a cloth and rub the residue
Use white vinegar on a cloth for stubborn residue
Apply a small amount of cooking oil or baby oil, then wipe clean
Use a glass-safe adhesive remover if needed
Wipe the glass with a clean damp cloth
Dry the glass with a lint-free cloth