That won't work. If you want get off that primer chemically, you'll destroy the ABS plastic.
If you want to have a dull black plastic look you can use something like black Plasti Dip:
PLASTIDIP.EU ... The EU supplier of USA PlastiDip!
Also i have to say that it is no wonder that the paint came out bad if you put the mirror housings in brake fluid, lacquer thinner, oil-base paint thinner, denatured alcohol, and acetone. That will affect the primer and the later on paint will never come out perfect if it reacts with the things you've put on.
Regards, Markus.
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