Good day folks!
As usual, I like to close the loop in appreciation for all the great thoughts posted.
First, while not 100% sure, the stripe seems to be, as several of you suggested, part of the gelcoat
. In either case, I did as Flyingriki suggested and picked up some polishing compound and proceeded to "buff" a small area (about 6-8") by hand, in line with the strip... worked like a charm!
Had the owner of the "detailing" shop stop by, showed him what I had done and he's sending his guys back to do the stripe by hand... annoying as all hell to have to tell someone that does this for a living what needs to be done, but I refer you to ramblinrod's post above...
So, while it might be a bit harsh, it looks like in this case, we can chalk it up to incompetence!