An interesting and now very controversial question. For 25+ years the definite guide to restoration procedures could be found in the annual Overstreet Price Guide. Then CGC came around in 2000 and unbeknown to all but a few dealers close to CGC, their definition of restoration did not include all the procedures included in Overstreet's guide to restoration. Most contentious was pressing.
As a result, those dealers close to CGC had comics cleaned and pressed and got Blue(unrestored) labels for the comics they'd submitted to CGC. But buyers of these early slabs were under the impression that the comics contained were unrestored under Overstreet's previous guidelines to comic restoration. This of course gave those dealers who were close to CGC a tremendous and very unfair advantage in the marketplace.
Nonetheless, CGC classifies trimming as well as cleaning with solvents as restoration and in particular notes any trimming detected on the label (or so I understand).
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That government governs best that governs least.
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