Used goofoff pro strength and ruined Hollywood

I can get one but need to figure out how to post it here.

I got your pics, tenup. It actually looks OK with what you did using the Copic. I'm actually surprised that it had that level of coverage. You could paint the entire back with it if you want it all to match. If you want it to look more like the original skin of the retail figure, you can actually something called Novus Plastic Polish. The 1 2 3 kit is on Amazon for less than 20 bucks and the 2 3 kit is cheaper. The 1 is just a cleaner but you might want it, too.

You start with the 3 and buff the whole of the back where it's discolored and it will take all the screw up stained plastic off. Then you buff with 2 and it brings it back to the same color and texture of the original skin colored plastic. Might be worth the investment as you can use it to take scratches and marks off anything plastic, not just figures but also I used it to repair the lens on my glasses recently and it didn't appear to change the prescription, polishing the lens on your headlights of your car and whatever else. I fixed a scuff on my GI Joe helicopter and the plastic was clear and it looks perfect which blew my mind.