We're having the same problem with our hailing port. (We're keeping the name.) Underneath the painted-on hailing port is Awlgrip, so sandpaper is not a good idea; it would leave scoremarks. Have been rubbing with mineral spirits and acetone for about three hours so far. Looks like another three or four to go. Yoga is nothing compared to kneeling sideways on the transom scoop with one hand holding on to the stern rail and the other attacking the lettering. Then you get up to refresh the solvent and turn the other way to give each arm a change.