I just removed all the vinyl striping off my 19' Stryker. I bought a can of 3m Adhesive remover, and some Goof Off, as well as a heat gun, and some straight razor blades.
What I found worked best was Patience. I got the striping started, and pulled it VERY SLOWLY, and evenly. I kept the tag ends about a 60 degree angle, kept my hold on 'em short, and just peeled everything back. I put in about 5 hours on one side of the boat on a Saturday, and then another 4 hours to finish it the next day.
After I got it all off, I spent about an hour just wiping it all down with clean rags full of the 3M adhesive remover, and she was good to go. I hate using solvents and be sure you're using a respirator in a well ventilated space if you do use 'em. Volatile Organic Compounds are not something you want in your lungs or your central nervous system. Don't ask me how I know.....
I had both sides "vinyled" a day later, so there's no exposed aluminum, except the bottom (below the chines), and the stern. It's a "one-off" design, and then I had a 9mm 3M ArmorCoat clear layer put over that. It cleans up like a dream, and I'll never have dull aluminum showing again. And NO polishing....
I'm inept at posting pics, but PM me with your email address if you want pics. I couldn't be happier with the results. My 3 year old boat now looks Brand New....