look up Nasal Irrigation.
I used the Neti Pot, and it was 10x more effective then Flonase and Zyrtec combined
But one day, I accidently dropped it on the floor, shit shattered
So I start using an empty dishwasher soap bottle. it's actually better than using the Neti Pot, cause you can squeeze the bottle which makes it squirt the water with more pressure so it only takes half the time