Remove ink stains on leatherette or imitation leather (sofa, chair, jacket, coat, bag, shoes, boots) with cotton wool soaked in makeup remover supplemented with a few drops of surgical spirit or vinegar or even hairspray. Rub gently, renewing the cotton wool as it gets dirty.
You can also dab the ink stain with a cloth dampened with stone clay containing a few drops of alcohol. Slowly and gently rub the stain in a circular motion. The stain will take a while to disappear.