Washing a vagina a few times a week is plenty. What is it with people getting all uptight over cleanliness?
You can wash your entire body as often as you want, but the twat is too fragile and cleans itsself. As it is the body's most important organ, nature has made it very complex, fragile and balanced. As you know, a pussy has a very delicate Ph balance, which has to be maintained. If you start washing it too often and with soap or other aggressive acidic substances, you destabilize the balance. So the best thing to do is: to wash it gently with water, but not too often, and once in a while to use a mild sugar solution, like milk with honey, or old coca-cola (this restores the pussy Ph). After sex, the pussy has been entirely destroyed, and its Ph has to be restored again seriously, so in this case it is good to use a mild sugar solution. Trust me, I'm a professional vagina expert. What you do with the rest of your body qua washing is not that important. But always respect the pussy.
It's like over washing your face, some things can be too clean. You can strip natural oils that are needed, that's why i don't use a lot of moisturiser.