Peel off as much sticker as possible with your fingernail or a plastic scraper
Apply a small amount of warm soapy water and let it sit for a few minutes
Rub the residue with a microfiber cloth
Use a little rubbing alcohol on a cloth and wipe the glue off
Try white vinegar on a cloth for stubborn residue
Apply a small amount of cooking oil or baby oil and wipe after a few minutes
Use baking soda mixed with a little oil to gently rub off sticky residue
Use a plastic-safe adhesive remover if needed
Wash the plastic with soap and water after removing the glue
Dry the plastic completely with a clean cloth