I do a lot lot lot of reflective removal. My fuel station clients use it everywhere. So I tested the time to do each type of removal to better our site time.
A trade magazine was going to do an article on it... But we found that it all comes off about the the same, it comes of about as fast as it takes to properly apply, 30-40 sq ft per hour on average. In most cases at least 50%, but usually 90%of the adhesive was left on the surface. And none of the methods we tried were really amazingly better given the cost of tooling or skill..
We tested:
chemical:
with "crystal tech Reflective". Very slow, messy, requires constant temperature. 36 PSF per hr in summer sun. 10 PSF per hr if surface if under 70 degrees. To get above 50 PSF, use a pressure washer after the chemical gets into the vinyl. It will remove glue from surface nicely But needs warm water, and sticky bits go everywhere.
Goof off with heat, again messy, can damage car plastics. 40 PSF per hr in summer sun. Strip vinyl first, glue second. Pressure wash to finish.
Steam with the aforementioned b&d steamer reasonably good but slow, 30 PSF per hr. Use a lil chiseler or yello tools yello blade to get that speed. Chemical strip remaining glue.
steam with a Dupray hand wand system, poor performer. 20 PSF hr very expensive. Anyone want to buy a used one?
Steam with a high pressure commercial steam cleaner, fast, 90 PSF per hr but requires lots of expense and risk of surface damage. Environmentally Messy. Blows sticky bits everywhere.
Manual with heat gun, 30 PSF per hr. Expect 90% of adhesive to remain and require chemical removal.
With radiant heaters, 50 PSF per hr. Same adhesive left over as with heat gun.
Wheel. 3M stripe remover, 20 PSF/hr
Wheel. MBX tool, 40 PSF but messy and tool head wheels are pricey. Can burn surface of not careful.
Dry ice blasting: 200+ PSF per hr.. by far the fastest, but very very pricey to equip and provide.
Manual with isopropyl alcohol and yello tools yello blade or a Zinser razor scraper.. well over 60 PSF per hr. FLAT SURFACES ONLY - LEARNED SKILL IF YOU USE THE 4 INCH RAZOR
Best type for ease of use.. a yello tools yello blade scraper with isopropyl alcohol as a lubricant between the surface and the film.. I can strip 80 PSF per hr this way. You hold the scraper at a shallow angle of 15 degrees or less to the surface, and squirt IPA into the blade and graphics gap as you wiggle it under the film. Can't do contours or indents, but on large areas it flies. The IPA acts as both lubricant and solvent, it dissolves most of the adhesive on contact, as well as any 94 primer it contacts. This is our go to stripping method for Reflective.
The scraper works at 36 degrees to 95 degrees surface temp. But it is a SKILL that needs practice. I use the razor, is faster, I move the blade as I do a squeegee, snowplowing the edge. and you develop feel for what it's doing.
Having said that, I have had hundreds of gas pumps and semis to perfect this on. Stripping decals and wraps, some were 5 years old, many were 10 to 20 year old Scotchlite.. on some cases we were removing graphics applied in 1978..
We removed 25,000 sq ft doing this test. We conducted tests in side by side conditions on like surfaces and films. Overall effort was fairly physical, and there just isn't a fast easy mess free way to get reflective of a surface.
I recommend you laminate all Reflective films onto a 2 mil vinyl with air egress and removability properties to avoid these issues in the future.