Try to avoid getting leather chemicals on the stitching or in the seams as it can discolour some threads. If the chemical gets in between panels, it may be difficult to get it out. This may even weaken the backing at the seams.
Leather stitching is usually cotton and nylon mix, nylon is attacked by solvents, they melt it and weaken the threads. An oil-based product will attract abrasive dirt and permeated the leather via the stitching, the oil will soften the leather, and the abrasive dirt plus friction may cause the leather to tear and / or the stitching to fail. Do not use a solvent-based cleaner as this may cause the stitching to fail over time
Stitching is somewhat friable if subjected to excessive abrasion.
Bearing this in mind the cleaner needs to ‘do the work’ without relying on friction; clean stitching using a medium / hard horse hair brush, a toothbrush or a sponge, spray and work the water-based cleaner into a foam or use Leather Masters™ Foam Cleaner, lightly rub surface and immediately wipe with a terry towel to remove excess moisture. You may need to repeat this process.
Once the stitching and the seating surfaces are clean apply Leather Masters™ Leather Protection this will help to keep the stitching clean and inhibit the ingress of dirt and soil