Well I use pine sol for my all metal minis. It'll melt plastic but as the bases are the only plastic on them I just replace it. For plastics I use oxyclean. Just put a couple of scoops into some water with the mini and it actually works. I just use old toothbrushes to get the paint off or real cheap Ones if I don't have any old ones. As for resin I have never worked with it so can't say what to use to strip it though I would try my oxyclean for the first try