What's the easiest way to strip the 73 plastic grille inserts?

[WH23G3G]

The previous owner sprayed blue lacquer over the original paint on my 73 Charger and he also did it to the plastic grille inserts. It's a shame too, because the grille inserts are totally perfect with no cracks or missing corners. I tried stripping it with the aircraft remover and it only bubbles and comes off in flakes and it takes forever to remove any significant amount. I don't think they can be blasted. What's another way to strip them without damaging the plastic? I was thinking about trying the paint stripper again and using a gas powered pressure washer instead of the coin op carwash pressure washer, but I don't know if it will tear or break the plastic.