at your local PPG store they have a spray can type of bumper striper im not 100% on this but it is supposeto work really well as long as you follow the directions I havent used it on plastics but have used it on the poly bumpers on cars you spray a heavy coat on and let it sit for a little while then you can scrape it off just a sugestion look into it before you do it the people at the store should be able to answere all your questions