For healthy clean skin, I recommend you do the following:
1) Cleanse your skin two times per day with a cleanser thats appropriate for your skin type
2) Gently exfoliate your skin at least twice per week. (I do not suggest exfoliating more than twice per week. You may strip your skin of its natural moisture)
3) Apply a moisturizer daily with sunscreen of at least SPF 15
In the evening (second cleanse), do not exfoliate if you exfoliated during the day (remember only two times per week). Also, apply a moisturizer without a sunscreen. Sunscreen only needs to be worn during the day.