This is totally anecdotal, but for what it's worth...
I screwed up on the cloak of a PP model (meaning pewter, not plastic), and was able to strip it right down to the bare metal (through Krylon black primer, several coats of Reaper acryllic, and even a little Future floor wax) using a Q-tip dunked in Tamiya acryllic thinner.
I have no idea if those results are typical, or if it will work on plastic, but it might be worth a shot for you. Good luck!
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