I would try 99% IPA. I've even used 91% with success for MTL, but I think it depends on the color. (e.g. alum/silver just falls right off)
If 99% doesn't work, I would try "Simple Green" cleaner/degreaser, and then "Purple Power" cleaner/degreaser. I've never had either damage plastic, and Purple Power is almost batting 1.000 with getting paint off model trains...in my experience. One or two Kato's held on to a few areas.
The camp fuel is for removing the lettering only. (hopefully, it does break through the paint eventually)