Milk works but you must use whole milk to get the best results. It's a good way to use up old milk as long as there are no curds forming in your milk. Skim milk does not work. Set it in the bowl and walk away. Come back in an hour or two and rub the stain with the fabric and the stain should be gone. Repeat as many times as needed. I use it all the time on my husband's dress shirts. When will men learn not to put pens in their pockets.