A week ago I was removing some yellow paint from my classics prime with some rubbing alchol. It did remove a lot of the paint but there were some spots of paint that i couldn't get of. Then, I heard that could remove pait with nail polish remover. So I tried that and it did remove the paint, but it also left white stains/marks and discolored the plastic a little. How did I fix this?
You might try to use some baby oil. Put a tiny bit on a cotton ball and rub on the white spots. Hope this helps.
You could always paint as close a shade of red as whatever the toy uses, or just paint it and the opposite side black.
For the record, one should never use acetone on a plastic toy they care about. There are much better paint removing solvents out there made specifically for these applications. You may have luck with one of those magic eraser / spot remover sticks, as their primary mode of action is to 'loosen' paint binding and spread it around, thus recovering the white areas. It would be wise to try and test this technique on a junker figure first.
If you used too much nail Polish remover, you may have compromised the integrity of the plastic. I've never used it on tfs, but depending on the plastic its used on, the plastic can soften, expand, crack, or become brittle. Clear plastic will get cloudy.