I picked up a bottle of paint stripper from B&Q and was astonished to find it was in a plastic bottle, not a tin.
The fluid stripped the paint fine, no problem at all. OK, anything else would have been something of a surprise but the key thing is what it didn't do. Have a look at the bases. They were on the models the entire time. The fluid stripped the paint but hasn't touched the plastic!!!
I think I have found a way of stripping plastic models.