I wish I had heard this on NPR or looked online for this solution 3 or 4 weeks ago. I had a bad cold that turned into a sinus infection that lasted for three weeks and all I needed to do was snort saltwater. I'll have to remember this for next time.
More info…
"Rinse with saline sprays. Saltwater rinses — or saline sprays — thin your mucus and get rid of irritants. Use an over-the-counter nasal saline spray, or flush your nostrils with warm salt water. The ratio of salt to water is approximately 1/8 teaspoon salt to 1 cup of water. Use a suction bulb or put some of the warm salt water in the cup of your hand to sniff it up one nostril at a time."