Personally I think some wash their face too much! I usually splash cold water on my face in the morning and pat dry, with adding SPF lotion to my face after. If I put makeup on (rarely) I will take it off with a wash cloth and warm water. Afterwards I gently wash my face and even more lotion! I also try to exfoliate once a month to deep clean but try not to over-do it or you could lose valuable moisture your skin needs/craves!!
Will echo the replies that say "water". As an acne prone I've found, and loved, jojoba oil as a simple moisturizer or boost to a cream. I add German chamomile e/o to the jojoba to heal up acne and keep my skin even toned. A miracle worker in my book!
Get enough sleep... eat plants... stay hydrated... skip the caffeine and alcohol... eliminate sugar and refined carbs... reduce stress... exercise... use clean and healthy skin care products... be happy and smile :)