How frequently should I use clean and clear face wash in a day on my combination skin?

I have a combination skin, and I have recently got some mild acne on my skin, around my forehead. I then bought clean and clear face wash for myself, as somebody of my friends told me that it is the best face wash for acne. However, I have some apprehensions about how frequently should I use it in a day. Presently, I am using it just once, in the evening, and have not really experienced any considerable change. I know its quite early to decide, as it’s just been a week since I have started using it. Nonetheless, I want to know from some skin expert how often should I use it on my face to get rid of this mild acne at the earliest! Please advice! Thanks.