@lenorj
I would concentrate of finding the cause. I could be allergies, sinus issues and inflammation, infections, etc.

Have you tried doing saline rinses? I use a saline rinse that you squeeze the bottle in one nostril and comes out the other. Then you reverse. Really cleans out my sinuses and they feel clean and improve my breathing.

I used to get sinus infections all the time. 15 years ago I had 2 sinus surgeries which stopped the sinus infections but by expanding the sinus openings have tremedous sinus drainage down throat and out nose. I am a constant nose blower now. However better than sinus infections.

I have tried to find and reconize triggers. I know there are enviormental ones as well food. So I try to limit exposure to them. That is what I meant about causes of the drainage can really help you avoid them.
Good luck!