I have very oily skin - I use Pro Active and it works like a charm. I highly recommend it. If you don't want to order something in the mail, any general store (Wal-Mart, Target, etc.) will carry generic face wash. You may have to play around a bit to find one that works for you, but odds are you will find something. If you have your heart set on not buying anything - Just wash your face twice a day with a rag and hot water. Also, get some sun. This will help as well. Just my own little tips from personal experience - I struggle with acne too :)
emc2acne.com read this it works! It is science. It was developed by a long time acne sufferer and a dermatologist. Other products dry you out and damage your skin even if they do get rid of acne temporarily but this doesn't and it's affordable! http://www.youtube.com/watch?v=IsITPRxXUhM here is a youtube video of someone reviewing the product and explaining why it works!
Try using coconut oil. Look up recipes that have coconut oil and baking soda. The baking soda will act as an exfoliator while the coconut oil keeps your skin moist. Don't use Pro-Active. That stuff just dries out your skin really badly.