We were at a friend's this weekend and he got blueberry juice on his shirt. He thought all was lost but I told he to try running it under boiling water. It worked and he thought it was about the coolest thing ever.
My mom taught me this trick, which she had learned from her mother. I am beginning to think that not enough people know it, since everyone I've ever shared it with has been surprised and amazed. So, in the interest of the good of society...
How to remove grape, blackberry, or blueberry juice - While the stain is still fresh, spread it out flat, holding it over a sink. Pour boiling water through the fabric until the stain disappears. (It happens almost immediately.)
I'll post more tomorrow - it's been a busy day.