I just took delivery of a '98 Arctic Silver M3 and have discovered the fountain of youth! One of the things that the previous owner did was to remove one of the decals on the instrument display panel (i.e. the 91 octane warning decal under the fuel gauge). What was left behind was a very strong adhesive residue that proved difficult to remove without the use of a sharp edge. I called up Tapeworks (a local shop specializing in decals for automotive use) and they recommended using a commercially available brake cleaner to remove the adhesive. Sure enough I was wary of using any kind of chemical that could potentially scratch the instrument display. But the lure proved too great and I ended up applying it with a paper towel. The adhesive took a few swipes, and instantly it was off the instrument display panel without any scratches to the plastic. This also worked for some velcro adhesive residue that was left on the dash for the previous owner's Valentine One radar detector. Just be sure to run some kind of moist towel after you use the brake cleaner on these surfaces.

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Edward

Try a heat gun... or a torch.