Mucus coming out is a good thing. That's the "safe harbor" for infection in our lungs that we need to cough up. I use Mucinex LA 600, twice a day. I buy it in quantity on line because it is so expensive at the drug store. The long-acting feature is important as otherwise it only lasts for 4-6 hours. Pure guaifenesin with no decongestant. The purpose is not to end the mucus - it is to thin it so it comes out more easily.
Which saline are you using? Sometimes 7% is too irritating, and might need to be alternated with something milder.
Sue