I did the same thing when I got my first boat (24' Baja). I laid the bag on the driver's seat and then started washing the boat. The bag got wet and the ink bled on the vinyl. I used every cleaner known to man on it that day - and in the end, after one/two weekends, the sun bleached it out. To this day, I don't know if it was something I used or just the sun or a combination of the two.