What is the best paint remover for a MTH Premier Aux Tender?

I bought a MTH Premier Auxiliary Tender a year ago. It's die cast all around and need help removing the paint/ decals. It has the Chessie System Safety Train decal, If I would of known that it was a PITA to remove the decals on it, I would've looked for a non-Pocahontas N&W tender.

What would you recommend for a paint remover that wouldn't compromise the ability to paint the die cast after soaking it and scrubbing the shell? We have tried Denatured Alcohol, it did nothing. I heard that brake fluid works but I'm concerned if that is used, it will make it unpaintable.

Thanks