For paint solvent try turpentine, it's an artists equivalence of acetone, be very carefool because it is very thin, since it's alcohol based, and will get everywhere if no caution is taken. It thins the paint, and you should be able to get it off. Read a label on a can or bottle of it to see if it's harmfull for plastic.

Acetone can work too, read the label as well.

nail polish is pretty much rubbing alcohol, which u can use too but i doubt it's strong enough for the 2 layers and clear coat