Biostrip20. So easy!
Put a few spoons in an old cup and put the model in. Leave it for ~30min.
Then wash off the stuff with warm water while brushing it with a toothbrush. The paint goes off easily.
Biostrip20 is undamaging for the environment and isn't very toxic (well, you shouldn't drink it.
) or risky for health. It's (imo) the best product for the job.
It also works on plastics and even works on resin. I just would recommend to get the models out after 15min and see how it works. Put them back in if its not long enough. But if you would leave it too long on resin it could potentially damage the material.
After using it on resin put the stripped model in the fridge for ~2 days to make it set a bit harder again since it could soften a littlebit if left in the Biostrip20 for a while.
I succesfully stripped 20+ metals, 20+ plastics and ~5 resin models with it so far.
DONT spill it on your painted table or anything. Recently I just stripped a bit more than just the miniatures.
I noticed the cup I put it on had a tiny hole in the bottom. After 30min a big area of the table lost its paint.