Maybe "vinegar essence" is what in Australia is named as acetic acid.
Household vinegar is only about 5% or so acid, it costs me about AUD1.25 per liter. With changes of vinegar along the way, over a week or so, I would use maybe 2 liters of vinegar to clean a fairly heavy incrustation of rust from a blade.
Acetic acid comes in various strengths, all the way through to about 80% acid.
I have no idea at all where I could buy acetic acid. We used to use it to burn warts off --- dab a bit on the wart with the end of a match stick, & that was bought from a pharmacist.
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