Actually that makes sense. When working with epoxies what I use to clean my hands is vinegar - it cuts uncured epoxy easily. And it's only a little bit smelly ... ;-) What I do is to put some on my hands and 'wash' it off with a throw away rag of some sort. This is normally only necessary when you have gotten far more epoxy on your hands that normal and I don't remember ever having to do this when working with epoxy on a model.
I have not tried vinegar on cured epoxy. But your experience with alcohol sounds like cured epoxy bonds -can- be attacked" ... if you are willing to wait. I suspect that what actually happened was that the alcohol 'dissolved' (broke the bonds) the epoxy 'one layer at a time' until the weight let go. I assume you also had to clean up and repaint the car after those long months soaking in alcohol. - Jim B.