Looks like this has been covered pretty well, but I need to up my post count.
I finally went to see someone besides a dermatologist.
It was the nice ladies at Normal Merle (or was it Merle Norman?).
They said the reason my skin keeps greasing up is that after I clean it, I dont moisturize it. So my face produces its own moisture. Oil.
The above advice about a cleanser and toner is good, but you should also use a facial cream or lotion to add good moisture to your skin.
A scrub every few days is also a good idea.
Also, dont buy any of Merle Normans overpriced crap. Get a cheap foaming cleanser, Sea Breeze astringent, and some low-priced Ponds cream.
All of which can be found at Wal-Mart or K-Mart.
And, to all the guys: I'm about as straight as they come. I have more smut in my entertainment center and more pr0n on my hard drive than many teenagers.
But at least once in our lives, every man needs to try a facial. It really helps.
Ask the lady questions while she's doing it. You'd be amazed at what you learn.
Dermatologists need you to keep coming back and keep buying expensive medicine. Even if they do know how to clear up skin, they wont share all their secrets.