It's going to be dependent on the type of ink you are working on, so I don't think there is any single remover that will work in all situations. Like anything we do, start with the least aggressive and work your way up. Ball point pen, felt tip pen, permanent marker, newsprint, etc are all different inks. That said, those are all solvent based. Even so, my first step is a 2-part stain remover (h202 +naoh) rather than solvent. Then I move to solvents. First one is similar chemistry to APC with added D-limonene. Next product contains IPA and Glycol Ether. Last contains acetone and d-limonene. They are all marketed to carpet cleaners rather than detailers. None are available on AG, so that's as much info as I can provide.