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Someone might be able to find out what Ferrari, Maserati and Bugatti recommend for treating their leather upholstery.

There may be a recent post regarding that issue.

Tra la la la la la la.......:dropjaw: I don't know about lard on a strop but it does wonders for a cast iron fry pan.

P. S. And cowlicks.

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Some of the best advice I have seen is to use a tallow based soap to condition the leather strop.
Here is an example of a tallow shave stick.