How often should you wash your face and how often should you exfoliate?

There is a difference right? I have sensitive skin..How often should you wash your face and how often should you exfoliate?
at least once in the morning and before you go to bed at night more if necessary.a good facial scrub once a week is good.How often should you wash your face and how often should you exfoliate?
Wash your face in the morning and before you go to bed at night.