So after a little search on stripping metal miniatures, note METAL miniatures. You will melt plastic and probably resin ones. I chose Acetone, and make sure you use personel Protective equipment (PPE) and clean them in a well ventilated area.
Here are the minis before I strip them, they had a rough time in the post so arms and blades need to be bent back to a nice pose.
I removed the backpacks and bases, put the bases aside for possible recycling.
If you live in New Zealand or Australia you will have heard of Bunnings that's where I picked up some Acetone. Make sure you use gloves and do it out side, the caution is there for a reason! Pop your mini's in to the acetone and wait about 24 hours. What ever you put them in make sure you have a lid other wise the acetone will evaporate.Then you can scrub them clean.
After 24 hours the paint was coming off with ease, I tried after about 12 and the paint was a bit gloppy so left it longer. I used an old toothbrush to scrub them clean. After I had cleaned them up I washed them in hot soapy water and voila.