I know you cant tell too much from a picture and with my eyes who knows what I actually see.
Anyway, it looks like a synthetic material. I would imagine it wasnt an actuall skin. If it is a skin then thats different but if its synthetic then just hwe like you would do for most fabrics.
You see a boat load of this type of style and fabric in San Francisco and it is always hwe, cleans very well too.
Best, Dave.