I have some 20 year old or so wool Blackbottom shorts with REAL chamois in them, left from my previous incarnation as a cyclist. I'm using modern shorts now, but might like to have these as spares, if need be, or to match the retro look of my Bata Bikers shoes

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There used to be some suggested "stuff" to apply to the chamois to keep it supple and I can't remember what. Any of you other old fogies remember how to care for these? The chamois might be too dry to recondition, but I'd like to give it a shot.
Thanks!
Brian