I grew up with acne, I started getting it when I was 12. I tried everything in my teenage years; pure washing, Proactive, Cetaphil... you name it I probably tried it (Accutane is probably the one thing I didn't try because my mom had heard that it caused depression and refused).
I went to a dermatologist when I was in sophomore year in high school. She told me that the only reason Proactive and the other stuff you see on TV work is because it gets the kids to actually wash their face. She basically flat out told me that Proactive is a scam for anybody with moderate to severe acne, the active ingredients in it are incredibly low.
She also told me it doesn't matter what you eat. Acne is based on hormones and clogged pores, it has zero to do with what you eat (I went a year without soda because I thought it might have been my sugar intake, a common old wives tale).
She prescribed me a topical cream called Evoclin, with its active ingredient being Clindamycin. She rated my acne as moderate to high, thankfully I never had severe acne. The prescription did work, but it had the horrible side effect of basically burning my face: the skin by my nose and my cheeks were horribly inflamed for a while.
I ended up combining it with another cream called Tretinoin. Finally, it seemed like it was working. At my peak I only had 2 pimples on my face. Then, just in my freshman year of college, the drugs seemed to stop working, so I stopped taking them because they started causing inflammation again as well.
Since I've stopped taking the drugs, I've only ever had a couple pimples on my face at any time. Though, I've never been completely clear ever, I don't think since before I started puberty.
Ultimately, idk if there really is a whole cure for acne, especially because so much of it has to do with hormones. The best you can do is keep your face clean, don't touch your face regularly, and wash it 2-3 times a day without soap. Using a sudsy soap will only clog your pores again.
Don't pick at your acne either, like LN said. I regularly popped my pimples when they were white heads though because they even more gross looking. You have to be sure to wash your face immediately after popping though, otherwise the gunk that's inside the zit will only stay on your face and cause another zit. Once you've popped a pimple though, refrain from touching it because that's what causes the scarring. I can say from experience that the only scars that I've gotten from zits are ones that I continued to pick at after popping them. Gengan's post may hold some truth because that's what I experienced, idk fully on the details though.