I do not know if most newcomers to the building know that our doorknobs in our apts and outside all all brass. One day I decided to polish one and after 4 hours of lots of elbow grease they look wonderful. However, since it took so much time and muscle I have decided to give them out to a professional.
But please look at the difference in the pictures below. It makes such a difference and we are blessed with all brass knobs that are all original.