No reason to keep ugly.
I'd skip the tolulene and razor blade, though, in favor of a an of adhesive/decal remover from the auto store. Costs the same as tolulene, but is targeted better for this job. And if you don't use a razor--you can't cut the hull, there's just no real need for it. (If you must use it--round off the corners of the blade first, that stops a lot of damage.)
A heat gun often resoftens the plastic so it pulls off in one piece instead of cracking off in little bits, so it can also be useful. You may find the hull is "whiter" behind the decal, from being UV-protected, so don't be surprised if there's a slightly raised shadow--raised because the gelcoat hasn't worn their either.