I first used pineapple juice to clean a keris blade in about 1955.
I used it because I had read that coconut water should be used to remove rust from a keris blade, and I could not get coconut water.
Since 1955 I've done a few blades with pineapple juice, and I consider it to be better than coconut water, which I have also used.
I agree that there are many possible ways in which to remove rust from a keris blade, however, pineapple juice does work very well.
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