Usually polishing compound and some elbow grease works pretty well for this. A mild solution of CLR and water might get the tougher spots done, too, although I’d test a small inconspicuous area first to make sure the CLR won’t damage the paint.
Usually polishing compound and some elbow grease works pretty well for this. A mild solution of CLR and water might get the tougher spots done, too, although I’d test a small inconspicuous area first to make sure the CLR won’t damage the paint.