Coffee Stain Gone

I was getting dressed and put on my yellow sleeveless sweater, then saw in the mirror that there was a big coffee stain on it. I had forgotten about that, it happened a couple of weeks before. It was on the lower side so I guess I didn't remember and hung it up when I took it off. Two weeks old coffee stain on a yellow sweater, I thought, this probably won't come out. I sprayed it with the pre-spot, and then threw it in the laundry bin. A few days later I did that load of laundry with the detergent and couldn't believe when I took it out - stain was completeley gone.