WHY SADDLE SOAP IS BAD FOR UPHOLSTERY LEATHER

Saddle soap is called just that for a reason, it's intended for saddles.
It contains ingredients such as lanolin, and high levels of preservatives such as beeswax, these leave a residue which can actually attract dirt on upholstery leather.

Saddle soap is more suited for Veg Tanned leather which traditional saddles are made from, this type of leather is cut much thicker and treated differently at the tannery, it has a very natural surfaces which is absorbent so it can absorb in the lanolin and beeswax.

The majority of upholstery leather is chrome tanned and pigmented, the pigmented surface provides a solid coloured barrier, it isn't absorbent. When saddle soap is applied it sticks to the surface and can create a sticky residue, this residue then attracts dirt, eventually leading to deterioration of the leather.