John, I used to use real pineapple juice:- fresh pineapples from Queensland taken from the fields and immediately run through a press, then canned.
It was excellent for cleaning rust, and even better for drinking.
I can still buy pineapple juice but its made from imported concentrate and it is totally undrinkable and no good at all for cleaning keris.
I'm betting that the only pineapple juice you will be able to find is reconstituted rubbish from Brazil or somewhere. Don't waste your time or your money.
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