I do the sinus rinse out, too. (Or as I like to refer to it... douching my nose... )
My voice coach told me to use water, baking soda and salt (I feel like I'm missing an ingredient... I haven't done it in a while), though, and not to use the saline stuff. I've heard that can really dry up your nose and cause irritation.
Either way, its really gross but totally works. I'd be sitting in my dressing room with nastiness just pouring out of my nose. It was really pleasant, but hey, at least I could breathe again!
"You! You are the worst thing to happen to musical theatre since Andrew Lloyd Webber! And you, well, I just plain don't like you."
~Stewart Gilligan Griffin