For glue, I use a semi-paste paint remover... Stuff is nasty though. Eats glue, yes. But it also eats plastics and burns skin... It'll also turn most fillers, putties and the like to goo. What I have found it doesn't do very well is remove paint.
As for Simple Green... That is my primary paint remover. Does a great job, and you can leave stuff sitting for months (and I usually do), and not have it hurt it. Doesn't hurt plastics either. Admittedly, it doesn't always work as you describe, and a toothbrush or two will help. But overall it's some pretty good stuff.
Caz