Im not crazy with the brake fluid idea bcus then you have to make sure its all gone or new paint will never stick. Not to mention its messy and the environmental impact when you clean it off. Laquer thinner not great either. Might or might not remove old paint but might melt away any grain texture on the plastic.

You MIGHT try outside with a nice cross breeze.... Easy off foaming oven cleaner. It contains lye (or used to...not sure now) and is caustic so wear gloves and goggles...dont get the spray in your eyes or breath it in. (then again...it is meant for ovens indoors....but I dont recommend breathing it and keep it off your skin).

Its an old trick model builders use to remove paint on plastic models without melting the model. Done it several times myself. Try using laquer thinner on a plastic model and see what happens.... melted blob! EZ off wont do that. Let the ez off sit a while then use a scrunge to scrub the surface. It might take a few applications scrubbing in between and a bit of time but it should work. Rinse thoroughly with water when done then wash thoroughly with another clean sponge using grease cutting dish soap like palmolive, joy etc... Use the kind without additives like aloe. JUST soap. Once dry it should be ready for paint. For best adhesion get plastic purposed spray paint....think krylon or rustoleum make it. The paint should be avail at walmart and likely home depot.