Cleaning diamonds with table salt

did you know that if you are in a hurry unsetting diamonds and they
are dirty that you could clean them fast by rubbing them in the palm
of your hand with a little bit of table salt?

in the older days, we used cigarette ash and also placed in the palm
of our hands. now cigarettes and places to smoke, are outlawed in
Canada, its difficult to be a casual smoker in buildings.