Originally Posted by Verbalkint

To remove that stuff from your leather, first, I'd try a damp microfiber cloth. If that doesn't work, I'd try Woolite mixed ~ 40/60 with water in a spray bottle, rinsed with water and wiped off with damp microfiber cloth, followed by Spinneybeck or Zaino's Z9 Leather Cleaner and Z10 Leather in a Bottle. You could also try dish washing liquid, mixed ~ 1:10 with water in a spray bottle, followed by leather cleaner/conditioner.