Not sure where you are but try Nitromors if in the UK...if you're in the US try Citristrip - its a bit girly but gets most of the paints ive needed to remove off...if that doesn't work use Klean Strip Premium which is nasty stuff....
Just stripped some old DX down and the Citristrip didnt touch it after 3 days but the Klean Strip did the job in an hour....just dont get it on your hands!!