I have a number of Cibie Biode headlights that I need to remove the lenses from and it's critical to not break any as the lenses are very difficult. Over way too many years I have dried heat (baking in the oven), many solvents, and of course razor blades and the like. I break about 1/4 of them and that is just not acceptable.

Has anyone found a way to do this? I have no idea what solvent Cibie used but after 50-60 years it gets rock hard. I will be forever grateful if you can help.

Many thanks,
John