Peel off as much of the sticker as possible
Rub the area with cooking oil, baby oil, or olive oil
Let it sit for a few minutes
Wipe away the residue with a cloth
Use warm soapy water to remove leftover oil
Apply rubbing alcohol or hand sanitizer to stubborn residue
Gently scrape with a plastic card or plastic scraper
Use white vinegar on a cloth for sticky residue
Clean the surface with glass cleaner or all-purpose cleaner
Repeat as needed until the surface is clean