Soak the area with warm, soapy water
Let it sit for a few minutes
Scrape gently with a plastic scraper or old credit card
Apply rubbing alcohol or white vinegar to a cloth
Rub the sticky residue until it loosens
Use a small amount of cooking oil or peanut butter for stubborn residue
Wipe away the residue with a clean cloth
Wash the glass with glass cleaner
Dry with a lint-free cloth
Repeat as needed for remaining spots