Thanks for the replies, I've got some 3M Restorer/Wax and Finess it II that's I used on my hull with a wool pad and buffer but was not sure if that would be too agresive. Should I use car products for the cowling? I have found the decals for my engine online for $60-$70 bucks which is steep but with the hull all cleaned up I'd like to get the engine looking the same way!
After buffing didn't help mine I sanded it the bought some Yamaha paint to match and shot several coats of clear on top. The paint was base coat clear coat and required several coats and sanding in the middle. Looks like new.