The Best Solution for INK STAINS!</b> Without the proper chemical treatment.these marks can be next to impossible to remove. </b> Three Cats INK BYE BYE advanced stain remover, a powerful formula. Tackles shoe polish, markers, and other heavy inks.</b> pH: 9.5–10.5.Safe on cotton, wool, and synthetic fibers.</b> Ready to use</b> USAGE</b> Each manufacturer of ballpoint pen ink has its own patent on the ink it uses. Since inks are all made differently from each other, some may respond positively to treatment while others may respond poorly. </b> Recommended Basic Method</b> Apply ink remover to spot. Gently agitate area with a bone spatula, working from the outside of the spot to the center. Blot area carefully from the outside in with a spotting towel. Rinse thoroughly with warm water. It may be necessary to repeat all steps if some ink residue is remaining.</b>