Jean, I've tried stronger vinegar, here they label it as cleaning vinegar.
What I have found is that when the material of the blade is good, dense material, well compacted and with a relatively smooth surface, the stronger vinegar does give a faster result, however, when the material is of lesser quality and not smooth and compacted the stronger vinegar tends to leave the blade looking like a sponge.
The time taken to clean is immaterial to me. In the past , with pineapple juice I would sometimes take 2 weeks or moreto thoroughly clean a blade, and perhaps renew the juice several times during the process, especially in summer. I like the process to proceed slowly because it is easier to control.
The brushes I use are old tooth brushes, hard is better, but I usually use soft brushes, because that's what gets used in the house. I do not use metal brushes, and frankly I consider them unnecessary, because the vinegar --- or whatever is being used --- softens the corrosion to the point where all that is required is relatively gentle brushing to remove the loose residue of the rust.
Yes, I acknowledge that my process is slow, but it is very, very safe.
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