Add two to three drops of dry-cleaning solvent to a white cloth. Begin blotting the outer edge of the old ink stain. Continue blotting while moving inward toward the center of the satin. Repeat the process until the ink stain is gone. Continue to Step 2 if the ink stain is still visible.
Apply a non-oily hairspray to the ink stain and let sit for two minutes. Blot the stain with a clean cloth dampened in cool water. Continue to Step 3 if the ink stain is still present.
Blot the ink stain with a cloth dampened in a mixture of 1 cup water and 3 tsp. baking soda. Continue blotting the stain until you have removed all traces of the ink. Pat the seats dry with a towel.
Fill a small container with 1/4 cup rubbing alcohol. Dip the tip of a cotton swab into the rubbing alcohol. Rub the ink stain with the saturated cotton swab. Dip a clean cotton swab into the rubbing alcohol when the first becomes soiled. Continue rubbing until old ink stain disappears. If the ink remains visible, proceed to Step 3.
Hold a hairdryer set on low heat several inches above the leather seats. Move the hairdryer in a steady back-and-forth motion until the seats are dry. Clean and buff as you normally would with a leather cleaner and conditioner.
Dampen a lint-free cloth with acetone-free nail-polish remover. Rub the ink stains gently with the damp cloth. Rub in a circular motion for several seconds. Clean and buff the seats as you normally would with a leather cleaner and conditioner.