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Memory unlocked:

My grandfather was a chemist who worked for the British government in the post war years researching reinforced concrete. I remember him relating a curious anecdote about a colleague of his who would wash his hands every day with some kind of toxic substance. My grandfather said ‘I told him that he should stop using that stuff to wash his hands, but he wouldn’t listen. Of course eventually he became very ill.’ It would seem odd for a scientist in a government research department to use something like this, but I wonder if it was a similar product that the chap was using. Curious.