Trick #3: Use your tongue & press between eyebrows
By pressing certain points of the body, you can trigger the fluid flow and clear the sinuses. You should push the tongue flat against the roof of the mouth, and at the same time, push a finger against the skin between the eyebrows.
Hold thus for 20 seconds, and you will feel the relief, as the buildup will soften, and the sinuses will start to clear.
Moreover, you can try the following: alternate between pressing the tongue against the roof of the mouth and pressing between the eyebrows, which is actually the Yintang acupoint, the location of the nasion, according to Dr. Joseph M. Helms, president of Helms Medical Institute and author of Acupuncture Energetics: A Clinical Approach for Physicians.
These methods will actually draw the fluid from the source of blockage, and thus clear the congestion in the sinuses, and treat all the accompanying symptoms.