If they are vinyl type, a single
edge razorblade will make short work
of them--use a heat gun to soften them if necessary. Take a piece of sandpaper and round the sharp corners on the razorblade.
After you get them off, you will need to take off the remaining adhesive
thinner. Then you will find that the area under the stripes is a different shade than the rest of the hull
....a few years in the sun will take care of that.