Black Seed Oil (Nigella Sativa) - hands down has completely kept my nasal passages clear and mucous free for over a week. Since it reduces the histamine response, my asthma symptoms, allergies are almost completely gone. The cat's sleep next to my face - and I wake up with a clear nose. Overall, reduces systemic inflammation in the body with a natural oil! I will be taking this for life! 1 tsp in am, 1 tsp in pm. That's it. Sure, it is bitter but the benefits are wonderful.
Here is a youtubevideo from Dr. John Gray - I can't imagine him talking about his sinus condition - but this is what he uses. A simple, but complete explanation.