Karn's natural sent is slightly musty and reptilian due to his Faunus heritage. That said he does clean and oil his armor daily, when circumstances permit anyway, and the oil is scented based on the local flora. In other words he smells slightly of metal, stronger of reptile, and strongest of all is natural pine (he crushes actual pine needles into the oil for the sent, so there's no artificial chemicals).<br/><br/>Periodically he removes all the non-metal bits from his armor and heats it in a forge till it's a nice cherry, this cleans off any debris he may have missed, kills any germs, and tends to remove any scent other then hot metal. However the flammable bits of the armor can't be cleaned in this way and so the best he can do is a thorough cleaning.<br/><br/>Showers occur whenever possible and take 5-10 minutes for a thorough cleaning, 2 minutes or less if he's in a hurry. You learn to clean fast when the only water available is a half frozen stream, whatever you can boil, and you have to clean up in the outdoors, in the mountains, in winter.