FWIW one of my headlights is original to the car, 18 years old and perfect on the inside. I have taken apart some other even older headlights that were really grungy and completely opaque on the outside, even one with a cracked outer lens, and the insides of all of those lenses were perfect. I feel your pain in not wanting to strip off the 3M film, but if no one else chimes in with any direct experience, I think the film has become dulled from road grit and your lenses are fine underneath.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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