I've tried just about everything and settled on 91% alcohol. I made a bath "tube" using an 18" length of 4" pvc pipe with a cap glued to one end for long models like passenger cars and a shorter one (or a metal cake pan) for smaller items. The pvc pipe will hold at least 2 qts of alcohol. Stick the passenger car in the bath and let it soak for 3-4 hours then take an old toothbrush to it to remove the paint. I also use a Mr. Clean Magic Eraser to get some of the stubborn paint off. I stopped using brake fluid when I noticed a couple of pieces were getting brittle, seems like brake fluid sucks the life out of the plastic.
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