1878 16 July 2 Brecknell's saddle soap, used in the Royal Stables... Specially prepared for cleaning and improving the appearance of saddles.
1979 J. Johnston 100 There was a smell of saddle soap and horse dung.
2002 Mar. 48/2 Tracey Dickson suggests treating smooth leather chaps pretty much like leather tack, cleaning them with saddle soap.