A hair dryer and carefully starting the edge with a razor blade if the decals are vinyl. I removed old boat letters from my 77 boat yesterday and the vinyl type came right off. However, the numbers were a lot thinner than vinyl decals, I assume the wet on type decals and would not come off with heat or any other normal method. I sprayed with oven cleaner let it sit a few minutes and used a kitchen Scotch Bright pad. Took a little scrubbing, a couple of applications and everything came off real nice with no damage to the Gel Coat at all. If the name was painted on it may come off nice with oven cleaner also. It did on my 74 project 23. Good luck!!
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