Brake fluid is good. I\'ve used Simple Green, too, and that actually used to be my stripper of choice.
Now, though, I swear by the Purple Stuff of Doom (TM). Ok, it\'s not actually called that, it\'s called Castrol Super Clean. Dunno about worldwide, but in the US you can find it at any auto parts store and places like Wal-Mart or Target. It\'s an all-purpose cleaner that will (litterally) eat the chrome off of a bumper if you leave it there long enough.
Simple Green and Castrol Super Clean have one major advantage over brake fluid, too: they\'re biodegradable, so you get no harm in letting them run down the sink (in fact, CSC makes a great drain cleaner, too). Brake fluid is a different story on that part--definitely not environmentally friendly (so if you use it, please dispose of it properly).
EDIT: Yes, CSC is safe on resin. My girlfriend used it to strip some big resin lamps not too long ago. The resin was slightly soft right after removing it, but it was 100% back to normal after drying out a couple of hours.
