Paint remover is aim to remove paint...should serve its purpose...maybe u can look at the instruction whether it can remove paint on plastic without harming it.
well... in dat case u need to know wat type of plastic u r dealing with...
last time i used paint remover on my original rim covers.. seems ok... de paint is damn thick... washing it off is messy... n i have to wear gloves so dat de peint remover wun get in contact with my skin...
mayb u can try a little on those unseen parts 1st.. then c how...