Help with a sweaty/greasy (yuck!) forehead!?

As you can probably tell from my question, my forehead -- especially right near my hairline -- is just constantly sweating, and when I wipe the sweat away a greasy/oily residue is left behind. I've tried a very basic astringent to help with the "oiliness", but it hasn't really done much. As far as the perspiration -- I've got no ideas at all. Help!