There is a device from India called a Neti pot that is used to cleanse the sinuses. Modern versions can be found in almost any chain drugstore. Imagine a slender bottle that holds 8 oz. of water. You add a packet of salt (comes with the device) to 8 ox. of warm water. Lean over the sink, using the nozzle squirt half the water up one nostril. Yuck... I hear you say. It does take getting used to and you have to keep your mouth open. After doing both sides, your head and sinus feel great.
I do this daily in the winter and my colds have all but disappeared.