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Ok, here's the actual thread (I was close on the details): https://www.reddit.com/r/Wetshaving/comments/4o69me/wednesday_sotd_thread_lather_games_participants/d4a15tp

As I recall it was soap given him 25 years ago by an old woman whose father had used to make it. Or something of the sort.

I've known people to use over 100 year old soap.