I've used a neti pot for 15 years or so. Every time I wake up and my nose is running, I use that and it stops. You put warm salt water in there - the same salinity and temperature as what's already in your nose, and put the spout up to one nostril and it runs out the other. I haven't had a cold or sinusitis since I started using it. I've given them to friends with bad allergies, and it fixes that too.