Hi there,
I've tried 2 ways of getting off the paint.
One is done with this:
http://www.retrobike.co.uk/forum/files/mr_muscle_oven_cleaner_722.jpgMr musce Oven, I don't know if you have there this kind of product but it's essentially a chemical spray that makes foam. Put all the parts in a plastic bag, or a plastic container, than spray the foam onto the model and parts, put a lot of it, when you can't see the model anymore then is't good

Close the plastic bag or the container and wait, repeat the process if you see that the foam is transforming into liquid. Some paints like acrylics or can spray takes like 24 h to get off, enamels is off in like 30 min. Depending of the paint you will have to wait more or less. When you see that you can rub off the paint with your finger or an old toothbrush, then it's time to take the model on a warm bath and rub off gently the paint.
Another way is using brake oil (brake fluid for cars). You put the model in a plastic container, than put the fluid in it, so that the model is completely immersed, you will need maybe 1 to 2 liters, you can recycle the fluid and do it again for another model.
In the first method , with the foam, just be careful because I think that clear parts will become foggy. So remove it if you have one.
Bye and sorry for my English