Stripping figures, I use general purpose paint thinner. It's messy and it's smelly but's fast and effective. By volume it costs less then one dollar per figure to strip. Resist the temptation to use metal stripping tools like paper clips, needles or razor blades since they scar the metal model. Soft tools are your friend, like a toothbrush and toothpicks. The toothbrush will melt after a while and obviously don't put it back in the bathroom.