Biros -- also known as ballpoint pens -- are popular because of their smooth writing ability and low cost. Additionally, it's possible to buy biro pens in many colours. If you accidentally got ink from a ballpoint pen on leather, one stain removal method works well. However, it depends on how much ink got on the leather, how deep the ink was rubbed into the leather, and how long the stain has been there.
Wipe down the area with the stain, gently using a clean dry white cloth. Wipe away any loose dirt or dust near the stained area.
Apply cuticle remover gel to a sponge. You'll only need to use a little gel, about the size of a 10p piece.
Scrub the area of the leather that's stained with ink. Use a gentle, circular motion. If you apply too much pressure, you risk ripping the leather.
Mix a solution that contains one part washing-up liquid and 20 parts water. Wet a sponge with the solution and clean any excess cuticle remover gel off the leather.
Wipe down the leather with the cloth to remove excess dampness. Allow the area to completely dry for at least six hours.
Any brand of cuticle remover will work. Use a clear version so you don't stain your leather.
Clean ballpoint ink stains as soon as possible after they occur.