Just leave it be! Bike really just needs a light cleaning, a full service, fork straightening and worn pieces replaced. The bike has such a nice mellowed patina to it that harsh chemicals, metal brushes and paint are not needed. Now that beautiful worn light that matched the rest of the bike will stick out like a sore thumb and be it's main focus rather than the beauty of the bike as a whole. In the end, the bike is yours to do as you wish...but I would step back to do research, ask questions and really think about it before doing something that cannot be easliy undone...