Hey Ellis,
Years ago my daughter used prescription nose spray for her sinus and found she had rebound affect so bit the bullet and stopped using it. For sinus/nasal congestion after my surgery and to this day, I use a salt water rinse. Seems to help and the salt water aids in keeping infection to a minimum. Some people use a netti pot, I use a rubber bulb syringe. The first time use is the hardest. It takes a few trys in finding the right position of your head while leaning over the sink with your head tilted as too much of a backwards tilt can have the salt water running down the back of your throat instead of out the opposite nostril. Cocking your head just right will get you the results your looking for. I rinsed twice a day, morning and evening. Now once a week for maintenance. Hope this helps. If you're brave enough to try the solution mix is: one cup filtered water to 1/4 teaspoon salt. You can add a pinch of baking soda if you find the salt water burns too much, which first time use you'll experience this and with continued use this will go away. I use the word "brave" as most people give up after the first time unwilling to figure out how to hold the head and most can't get past the burning sensation.