Using brake fluid to remove paint?

[RobertInOntario]

Here are a couple pics of the loco's plastic body. It's showing its original black but there are still a few bits of apple green remaining. I'm using an old tooth brush and a wooden stir stick to scrape away this green but these last sections are getting difficult to remove.

Also, the rubbing alcohol has left a grey/white after-effect in a couple places, along the front of the boiler and a little on the cab roof. This should be no problem since I'm planning to spray paint the body again.

(Please excuse the few water droplets left on the loco body -- I was just allowing it to air dry on a paper towel.)

Question: Should I meticulously scrape away these final bits of green or should I simply spray paint the new black over them?

Rob