Soak the sticker with warm, soapy water
Let it sit for 10 to 15 minutes
Peel up one corner with a fingernail or plastic scraper
Lift the sticker off slowly
Apply rubbing alcohol, vinegar, or adhesive remover to leftover residue
Let the residue sit for a few minutes
Wipe the residue away with a soft cloth
Use a plastic scraper for stubborn spots
Wash the glass with soap and water
Dry the glass with a clean cloth