Hey folks I thought I'd share some information on a product called Simple Green. Quite a few of my gaming buddies use the product to strip old paint off unloved miniatures. It purports to be non-toxic and bio-degradable which is fantastic in case you accidentally spill any on your skin.
The great thing about Simple Green is that it does not melt or damage plastic mini's. I have just recently stripped some old stands of Epic orks with no damage to the detail or integrity of the miniatures.
I usually soak the mini's I want to strip for 24 -72 hours (depending on the stubbornness of the paint) however as little as 1 hour may be long enough for some paint jobs. I remove any residue with a soft bristled tooth brush.
Simple Green is available from Bunnings Warehouse and Mitre 10 Mega for around $6.70 for close to a litre. The great thing about this product is that you can use it again and again (except that it turns into a paint sludge - gross).