I too don't like the silvery grey color that teak will turn if un treated. I was at a local Home Show in the spring and came upon a salesman selling teak furniture. I told him about a bench I had outside my home that turned grey. He suggested I go to a Boat/Marine store and purchase a liquid cleaner to get rid of the grey. He had bottles of teak oil that I purchesaed from him. I also found the Teak Oil in the Marine supply store. Seems they use it on the teak wood on boats all the time.. Good luck.