I repair old fountain pens as an additional hobby and have lots of ink get on my clothes etc. There is a product called amodex that is specifically formulated to get out ink stains. I have no financial interest etc... in this company, just a happy user. My son left a ballpoint pen in his pants and it got all over a load of clothes. It took it out in a a flash (thank god for him my wife was upset!!!). It is expensive, about $10 for a 2 oz bottle, but a little goes a long way.