PhillipM
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It may well be the case that if you need something to work within a few minutes, then Product A may be best, but in cases where you can leave it for some time, Product B may be better.
I once experimented putting droplets of releasing agents on to a flat sheet of steel with a thin layer of rust. I was using a tiny glass syringe and needle to get really small drops. You can watch how the liquid spreads out from "ground zero"; you see quite different behaviour. Ideally, you would cover the test with a sheet of glass to minimise evaporation of the volatile components. It's always at the back of my mind to re-do the experiment, but in a more careful way, and get some pictures.
If it's something that can wait days it gets citric acid as strong as I can make it. Can't be rusted together if the rust has dissolved.