There are a few things you can do to get ink stains out of leather car seats. The first is to use a mild soap and water solution to clean the area. This will remove any built-up oils and make the surface more receptive to cleaning. The second step is to use a dry cloth or paper towel to apply pressure and scrub the area until the ink is removed. Be careful not to damage the leather. The third step is to use a vacuum cleaner with the hose attachment to suck up any liquid that has been left on the seat. This will remove any built-up oils and make the surface more receptive to cleaning.