What is the procedure to solve liquids spills?
The best thing is to avoid them. If you do get a spill anyway, our experience is that it’s best to let time fade it away. Since it’s a living material, the leather will become darker over the years and the stain will show less. But it will never disappear completely.
We have had many people who have spilled wine on their chairs for example but they are still happy with them anyway since the wine spot serves as a memory of good times and of the living material.