All of the bones of the face and sinuses are flexible. You can also push up on the roof of your mouth, alternated with pressing the space between the eyebrows. This acts like a little pump to move mucus around. Weird, I know.
I was once part of a study to test the effects of cranial manipulation on the sense of smell. I learned that I have a terrible sense of smell… and that I was in the control group. So I have no idea if it helped with smell, but this one part of it showed me a great way to drain my sinuses.
