Well, the provided context is about as helpful as a chocolate teapot, offering a link to someone else asking the same question and the generic fine print for YouTube. So, let's toss that aside and get to the real expert advice for your artistic emergency.
So, a rogue pen has decided your leather sofa was its personal canvas. Deep breaths. Before you do anything, remember the golden rule of stain removal: test any cleaning solution on a hidden spot first. Under a cushion or on a back flap is perfect, unless you enjoy turning a small line into a giant, discolored declaration of failure.
Your first and gentlest line of attack is a simple solution of mild soap and water. Mix a few drops of dish soap into some water, dampen a soft, clean cloth, and gently blot the ink stain. Do not scrub! You're trying to lift the ink, not wage a war on the leather's finish. Patience is key.
If the soap and water merely amused the ink stain, it's time to escalate. Dip a cotton swab in isopropyl (rubbing) alcohol and gently dab the mark. The alcohol should start to dissolve the ink, which you'll see transferring to the swab. Keep using clean parts of the swab to avoid smearing the ink into a bigger, sadder mess. This method can dry out the leather, so be prepared to follow up.
After you've successfully vanquished the ink, wipe the area with a clean, damp cloth to remove any residue. The final, non-negotiable step is to apply a good quality leather conditioner. The alcohol is harsh and will have stripped the natural oils, and a thirsty, cracked sofa is a bad look on anyone. This little spa treatment will restore moisture and help your sofa forget the whole traumatic incident ever happened.
