Depends on the liquid that caused the stain. The leather isn't cheap coated stuff, it's dyed through. I've used the leatherique treatment on seats that has removed some stains. What was the cause of the stain? What color?
02 E39M5 | TiAg/Schwartz | Tubi Rumore | Ultimate Ti Pedals | E60 SSK | Jim Blanton 3.45 40/100% | Coby Alcantara | StrongStrut STB