A 3750psi pressure washer w a rotary tip might peel loose liner, it did on mine.....
The 1st application of aircraft paint stripper loosened some more....
More 3750psi pressure washing.....
More aircraft stripper....
and repeat until liner free.......
plainly it sucked more then ya'd think........
if you can hook up to a HUGE hot water heater, 3750psi hot water seemed to work better......