Today i learned that diving into paint removal is like asking someone to explain what a widget looks like. LOL

There are different types of plastics as well as different recipes for paint types (one acrylic may not be the same recipe as another acrylic even of same color).  All react differently to different paint removers and chemicals.

The bottom line is use what you have in the house first that is safe for plastic ie rubbing alchohol.  Then try a different product until you find the one that works for your project.

If it does not work then it may work on the next project.

For me i used some gritty hand cleaner and soap and water.  Then went to half thinner and half simple green.  Then rubbing alchohol.  Each step removed some, and some more than others.  Trial and error.