For 30 years I refused to believe that sniffing salt water is the best cure for sinus problem. Two years ago I tried it out of desperation. My sinii, blocked for 2 months with many other medicine, opened up two days after I started sniffing salt wate into my nose. Gross, but the relief is worth it. Apparently sea water is the best, but failing that, water with salt and baking soda also works a treat. And if you want to fork out some cash and the thought of sniffing water out of a glass freaks you out, you can buy Sterimar from your local chemist. It is a pressurised spray of sea water.
Do not make the same mistake I did for 30 years, it really works