i was driving to work and my co-worker spill half can of coke on my rear leather seat, the coke went into the hole before i can reach a towel, does anyone know how can i clean it? or which cleaner should i use? it looks okay on the surface but just worry about the inside stain and smell.Thanks

 

which hole? perforation on the leather or just in the crease where the lower half meets the back?

 

Unfortunately the coke will go through the perforation, and seams and soak into the rear seat cushion foam, and theres no way to remove it either
I've taken apart my rear seat cover, to find some nasty 13 year old spills in the foam

Just try to remove as much as you can, and dry out the cushion. Then clean and condition the leather.