Mostly decongestant, but it really clears it out, if you can take the scent-
Boil apple cider vinegar ( smells slightly better than white, and I usually have it ), turn off heat, use a towel over your head and inhale. It will feel weird in a thousand different ways, but it works.
I also hydrate with extra water and herbal teas.
If it is really bad, I'll drink pedialyte.
Also, spicy soups! The spicier the better.