I've had a on-again-off-again cold for the past week or so, and today, the symptoms were stuffed up nose and sinus pain. So I wandered down to the local pharmaceutical (drug) and pharmaceutical accessory (drug paraphernalia) shop and bought a neti pot. And used it. My nose is now the clearest it's been since, well, ever. It will probably get stuffed up again in a few hours, but hey, I'll just neti again.