If you drink wine you are no longer on the cleanse. Wine contains fermented grapes and probably additives like sulfites . Not to mention the alcohol! Your body is busy enough trying to clean itself out...why would you want to add the extra stress to the process? Give your body a break and don't add anything to the process or you will be sorry for the extra stress you put on your organs (and heart). If you need wine to help you relax...then I suggest meditation or a hot bath, maybe even a steam if you have access to one.
Wine is indulgent while fasting is a period of abstenence. Simple as that.