Peel off as much of the sticker as possible with your fingernail or a plastic scraper
Soak a cloth in warm, soapy water and press it on the sticker for several minutes
Gently rub the softened sticker residue away
Apply a small amount of rubbing alcohol, white vinegar, or cooking oil to the residue
Let it sit for a few minutes
Wipe the area with a soft cloth
Use a plastic scraper or old credit card to lift stubborn residue
Wash the plastic with soap and water after removing the sticker
Dry the plastic with a clean cloth
Test any solvent on a small hidden area first