Peel off as much of the sticker as possible with your fingernail or a plastic scraper
Rub the residue with a cloth dampened with warm, soapy water
Apply a small amount of rubbing alcohol to a soft cloth and wipe the residue
Use white vinegar on a cloth to loosen stubborn residue
Rub a little cooking oil, baby oil, or mineral oil on the sticky area
Let the oil sit for a few minutes, then wipe it away
Use a paste of baking soda and water for tougher spots
Gently scrape softened residue with a plastic card or scraper
Wash the plastic with soap and water after removing the residue
Dry the surface completely with a clean cloth
Test any cleaner on a small hidden area first