Old yogi trick apparently, works well for hay-fever and apparently sinus problems as well.
Basically involves mixing up a saline solution of warm water and sear salt. Tilt your head back and gently pour said solution into one nostral. Eventually after backup up a bit it'll start to drain out the other, bringing with it the usual nose gunk.
It does feel a bit strange the first time but seems to work - a sort of nasal irrigation.
I've made my own apparatus for this consisting of a small orange juice carton (like your cardboard milk container). Make a hole above the pourer nozzell, fill the vessel with the saline, put nozzel to nostral and pour away.
Ahhhhh