You wouldn't think face washing would be an exact science, but over at The Wall Street Journal dermatologists suggest that for the best skin, you want to stick to washing your face only once a day at night.
The myth of washing your face twice a day just isn't necessary for most people. It's also just a bad idea. The Wall Street Journal explains:
Unless you have a skin condition, such as acne, some dermatologists say you only need to wash your face once a day -- in the evening. Nighttime cleaning removes makeup, pollutants and other dirt that has collected on the skin. Washing twice a day can cause dryness, a particular concern as women and men age.
Of course, everyone's a little different so you might need to tweak to fit your needs, but you can head over to The Wall Street Journal for a bunch more tips to do just that.
The Real Dirt on Face Washing [The Wall Street Journal]