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I think there are about a half-dozen good tutorials on paint stripping on dakka alone, but for your comfort:

Plastics of all kinds --> isopropyl alcohol. (+ultrasonic bath)
metal miniatures --> tetrahydrofurane (+ultrasonic bath).

The Ultrasonic is not strictly necessary but speeds up the process. In any case, you will need a brush to clean the stickier remains of paint from the miniature.
THF is a total killer. Superglue, Paint, Primer... but it will definitely obliterate any plastic you put in it, so metal miniatures only, and don't forget to remove the bases.