How do you get ink out of clothing?

Rubbing alcohol. Put a folded paper towel underneath, dab the alcohol on with a cotton pad and blot - don't rub, rubbing spreads it. Keep moving to a clean bit of the pad as it picks up ink. Then wash as normal and check it before it goes anywhere near a dryer, heat sets whatever's left. If it's actually on the sofa rather than clothing, check the cleaning tag and try a hidden spot first.