would white spirit work?
I tried iron x and it didn't even touch it.
I'm not surprised iron x didn't touch it. I would try some tar remover. I'm not sure if thinners on the body work would be a good idea but I don't know, I wouldn't risk it myself.
I might consider trying to heat the glue a little bit with a hair-drier and using floss to try and get under it.
Either way I would probably expect a little bit of damage unfortunately. I reckon you'll be lucky if there is nothing.
I'd be looking at Tardis and IronX initially. If that doesn't shift it and you're a confident detailer, the next step would be wet sanding with >2000 with a block to ensure you're sanding with a flat face/surface to minimise surrounding damage, followed up by a finishing polish like Menz 85.