use nail polish remover or polish remover.but make sure you dry it after you use the remover with a dry cloth other wise it will stain your couches or even change their colour! if its more than three days on your couch it will take longer to do it.in the polish remover it can have acetone or acetone free. ive experienced it because it happen to me when my daughter scribbled all over the
leather couch it was a disaster but in the end it came off
another way is to rub alchohol on it but i cant witness it because ive never tried it