What I was taught for whitening a blade was to use coconut husk and abu gosok ; abu= ash, gosok= rub, its what is used in Jawa to polish dirty saucepans, and is effectively an ash from the burning of various materials, like coconut leaves, or even the ashes left from burnt charcoal.
This whitening process is done after the blade has been totally cleaned by mild acidic action over a period of time.
However, what I use in Australia is steel wool and Ajax sink cleaner powder. I find this quicker, easier and better.
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