Use a mild astringent or toner everyday to clear off excess oils on your face. Avoid the stronger alcohol-based products. Even if you feel that it gets rid of more oil from your face, just like with the cleansers, you are actually encouraging more production of sebum if you dry your face out completely.
To prevent clogging, cleanse at least two times a day but do not scrub hard, as you will hurt your skin more than helping it. A slight pressure from your fingers is friction enough to slough off the dull, dead skin.
With oily skin, moisturizing need not be done everyday. But on the occasion you face feels tight due to cleanser and toner use, apply a light, oil-free moisturizer. Avoid products that contain substances as mineral oils and cocoa butter as they are too emollient for your skin condition.
Cosmetics for Oily Skin
For your makeup, choose oil-free products, especially for your foundation and blush. Go for water-based and non-comedogenic products that will not clog your pores. Some foundation products are designed to absorbing oil, which can control the shiny look during the day.
As it is with any skin type, do not forget to apply sunscreen (NON-oil based, of course). There are alternative forms of sunscreen out there, and gel is becoming a popular choice since it is less greasy than conventional sun block lotions. To be effective, your sunscreen should be at least SPF 15.
If you have severe breakouts of acne, use cleansers that contain a mild amount of salicylic acid that clears your skin. Moisturizer containing the same substance is also a good follow-up.
Finally, try to watch your diet as well. Refined starches, sugar, and processed foods may aggravate your naturally oily skin. Choose food that is low in fat and eat more fresh fruits, vegetables, and grains. Drinking lots of fluids (6-8 glasses a day) of water, juice or teas maintains good skin tone. Keep your vitamin and mineral intake up especially with vitamins A, C and B complex.
It will take time for your skin to get into shape as far as being less greasy. But the effort and discipline you put in will pay off. And as mentioned before, as you care for your greasy skin now, the benefits of less wrinkled, dry skin will follow you years later.