Possible. We used that on model car kits without any damage to plastic.What about brake fluid?
Ya. That works well to. Not very aggressive. But it works goodI've had good luck with Easy-Off oven cleaner. Sprayed the part and put it in a plastic bag over night. The paint washed off with water and a little scrubbing with a rag or brush. I haven't tried it on a fan shroud. You should always test it first, maybe on the bottom that you wouldn't see.