F&C kits paint removal question

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I have some old F&C milk car reefers that I am trying to remove the Pullman green paint from to repaint. The kits are the older blue box kits, resin is kind of an orangey tan. One kit I have been letting sit in Scalecoat Washaway for about 12 hours, the other has been soaking in brake fluid for roughly the same amount of time. There has been next to no paint removal. I have to stop at Walmart tonight and I'm going look for some liquid Easy Off, Simple Green, & the Purple Stuff. So I'm looking for any other thoughts or suggestions or possibly what kind of paint this could have been.

thx,
Mark