Once you have cleaned up the anodizing as suggested, it is easy to reanodize with a sulfuric acid solution and a battery charger. Sulfuric acid is most easily
obtained as one of the drain cleaners, you just have to look at the labels. Perhaps 30 minutes to an hour would suffice. You do have to take care to fully
clean the metal and avoid finger prints eg use neoprene gloves to handle. It is quite easy and less dangerous than the oven cleaner used to remove the
anodizing. You can google how to anodize for details. A clear coat over this will protect it.