What is the fastest working over the counter acne treatment?

I want to get rid of my acne before school starts. I have combination skin and I break out a lot during my period, even though I still get acne all the time. I want an acne cleanser or treatment that I can get somewhere like Walmart or Target, but I will be willing to splurge for something like Clinique if I know it is going to work. What are the best products out

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