I did this one thing that helped me clear my sinuses and overall feel a bit better.
I'm no medical expert but subjectively it felt good.
So I put a bit of pepper in my nostrils, cover the area.
Then used the Physiomer Strong Jet Sea water extract (Alternative is neti pot) to launch the pepper into my sinuses.
As you can imagine this irritated the sinuses quite a bit and caused me to sneeze a lot. However the sneezing unclogged a lot of the mucus and made my sinuses have a diarrhoea effect.
Then I cleaned the sinuses once again with the salt water.
Not a bad trick to relief the symptoms, I'm not aware of any negative effects.
Best luck.
PS. I suffer from sinus and gut problems chronically and have joint pains etc... I'm trying to find a way to feel normal and healthy again, cause life isn't enjoyable like this, nor productive. I've been bodybuilding for 6 years and eating decently so I'm not sure what is causing the problems lately. Perhaps spending a lot of time on the PC, having weird sleep schedules or eating before bed is contributing to the problems. Help is appreciated.