Soak the glass with warm, soapy water
Let the glue soften for several minutes
Scrape gently with a plastic scraper or old credit card
Apply rubbing alcohol or acetone to a cloth
Rub the glue until it loosens
Use white vinegar for stubborn residue
Wipe the glass clean with a microfiber cloth
Repeat as needed until all glue is removed
Wash the glass with glass cleaner or soap and water