For anyone, never post anything that you might ever want to take back. It's too hard to remove posts and few admins would do it - a poster has no right to demand it. On top of that, there's cached copies all over the Internet. And what about the replies that say, "that's right, ueny, I tried Coco and..."
It's like trying to put toothpaste back in the tube. Er, maybe like putting jism back in your dick...