A doctor friend of mine gave me some advice for sinus infections. He had me mix 1/4 teaspoon of salt with 1/8 teaspoon of baking powder into 2 cups of warm water. Use a nasal aspirator (in the infant section of grocery stores) to suck up the water and squirt it into your nose twice a day when you have an infection. It isn't the most pleasant thing, but it cleans it out before it gets worse. No prescriptions or OTC meds do better.