Congratulations on being acne-free. I know how triumphant you feel when you finally discover your own personal key to this sought-after state.
I suffered from horrible Acne from age 13 until I was in my thirties. I mean constantly broken out with scars and bumps, oily clogged pores and running sores. Now I am in my 50's and receive compliments on my skin all the time.
For me, the key to beautiful skin is a diet without sugar, Sugar substitutes, bread or bread products. Also, no drugs of any kind, especially street drugs which might contain anything. The Atkins diet does wonders for skin. Plus, as much water as you can drink, but no "diet" drinks or anyting else! I still drink a big cup of coffee (caffeinated!) once a day.
A cleansing program sounds llike an excellent first step for anyone, but it seems that the "key" factor may be different for all of us. My Acne was caused by sugar, carbohydrates, drugs and hormones. Eliminating them cured it. You are right that the cure works from the inside out, no matter what approach is chosen.
Good luck to everyone who is struggling with this problem!