Yeah good call on the test it first I usually add that images/smiles//icon_biggrin.gif any attempt to strip the paint might effect the resin itself, it all depends on the resin used and stripper being used.
I would be very carefull with brake fluid on resin kits, it works great for may other plastics though, you can always test it out. You might also consider and TEST 'Easy Off' oven cleaner the 'Original Formula' or a cheap knock off brand that contains mostly LYE as the active ingredient.
As always test first and let it sit in excess of the amount of time you plan to be working with the remover.
Also once you get it clean soak the resin part in clear water for a day to make sure any reaction with the resin is ended.