I had 3M transparent film on my '03 Boxster, and after about 10 years it really looked bad. After scraping with every tool I had for days, one of the body shops in town said they had good luck using a pressure washer to take the film off. I used the white nozzle on my 2500 psi pressure washer and sure enough, it took the film off easily without damaging the paint. It did leave the adhesive residue, which then came off easily with 3M Adhesive Remover.
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