I've been trying various methods of paint removal from plastic over the years. Scale Coat had a paint remover that worked fairly well but it cost an arm and a leg, plus now SC is gone. I tried the brake fluid method, leaving the shell of a Lionel F7B soaking in it for a month... it took the decals off, period.
I'm now trying Purple Power which was recommended in another related thread. The B unit was soaking for 3 days without noticeable effect so I left it over the weekend and we'll see.