If the miniatures you want to strip is metal get some Paint Brush Restorer (available for B&Q, Homebase ect) and put the minis in a glass jar with it, soak them for 4-5 days and then scub them down with a toothbrush to get the paint off
if the miniatures in question are plastic you can do the same using Dettol
(do not put plastic miniatures in the Paint Brush Restorer they will melt)
-----------------------------------
~The ravings of a single mad Goblin is bad enough, but such a power-hungry, malice-filled creature as Mortis can never hope to be understood~