Thanks for all those comments. I should say that I've never used washing-up liquid - I mentioned it because I think the word 'wash' could be misleading. I don't peel apples, and don't wash or rinse them either. Perhaps I should rethink that. I don't peel spuds either, just remove any mud. I didn't know that commercially grown leeks aren't earthed up so thanks for that absent.
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. I don't usually peel potatoes (they mostly mash OK with the skins on) and I only wash them if they look muddy. We seem to survive allright. I wash home grown lettuce in salty water so that the beasties crawl out. My gran taught me to do that.
Try mixing some in a saucer without the water and see what happens. It will fizz, cancelling out the acidity of the vinegar in the process.
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