Get a copy of "Clear Skin" by Kenneth L. Flandermeyer MD. I think it's been out of print for a number of years. But, you ocassionally can find it at used book retailers and Amazon. At this writing, Amazon has three new copies of it (starting at $50.80!) and two "collectible" copies for $6.80. It's a paper back. So, I'd grab a less expensive one.
In the summer, I have to use the cleanser full strength twice a day in order to sufficiently break up the kind of oil that forms on my face. This regimen would cause too much irritation for anyone that does not have thick skin and oil. The cleanser's active ingredients are 2% sulfur and 2% salicylic acid.
These ingredients used to be in Fostex Medicated Cleansing Cream (no longer available). Fortunately, Sebulex which is technically a Medicated Dandruff Shampoo has these active ingredients. This product used to be stocked automatically at Walgreens and CVS. Here's an option for buying it online.
These days, we all need to pinch pennies and while the cost of Sebulex has probably doubled in 10 years, it is still only $12. Even using it full strength, this one bottle will last me 6 months. I buy two at the same time for one year and I have to pay $5.00 in shipping and handling. That's $29.00 a year, $2.42/month or 8 cents/day. If you instead use one of the newer products now available like Proactiv, assuming you'd get a monthly shipment and it's $19.99 plus $5 shipping and handling, it would be approximately $19.99 + 5= 24.99 mo x 12 = 299.88/year or 82 cents a day. That's 10 times as much money!
You have many choices today for keeping your skin clear and healthy. Just remember, despite all the fancy packaging and advertising out there, it does not have to cost you a fortune. If you want to try going a cheaper route, the only real challenge may be to correctly classify the oiliness of your skin, identify the right cleanser strength and the frequency of washings.