My boyfriend’s doctor also recommended this to him (I forget what the thing you use is called, but it’s a baby product sort of like a very small turkey baster.)
My boyfriend swears by this, and keeps trying to get me to try it, but I’m afraid of drowning myself or something (I’m pretty spastic). You can also buy saline nasal sprays which sometimes help me out (helps a lot if you fly a lot and have sinus problems.)