Make a Scrub or Masque
Giving your face a very light scrub can remove excess surface oil. Try this almond honey scrub: Mix a small amount of almond meal (ground almonds) with honey. Then gently massage (don't scrub) the paste onto your skin with a hot washcloth. Rinse thoroughly. You can also make a scrub from oatmeal mixed with aloe vera. Rub gently onto the skin, leave on for 15 minutes, then wash off thoroughly. If you suffer from acne on your face, however, you should probably skip the scrub, since it can aggravate your already-irritated skin.
Masques applied to the face can also reduce oiliness. Clay masques are available, or you can mix Fuller's Earth (available at pharmacies) with a little water to make a paste. Apply to the face and leave on for about 20 minutes before thoroughly rinsing off.