Apple cider vinegar is famous for addressing mucous. Drink 3-5 teaspoons of ACV a day for several days and you will notice a huge difference in the amount and especially the viscosity of mucous in the body.
When I used to get sinus infections regularly, ACV was the only thing that used to clear out all the mucus clogged up in my sinuses. Just remember, it does take two or three days to begin to see the effects.