Another option would be to use NAC N-acetyl cysteine orally. NAC is a "building block" of glutathione. It is anti-mucolytic (disrupts the production of mucus) and has anti-inflammatory properties. (Long explanation here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2707813/ )

The advantage of NAC is that it is a capsule, you are not introducing a foreign substance into your lungs. This is important if you also have asthma or reactive airway disorder, as inhaled glutathione can cause bronchospasm.

I have had good results using NAC, as have some others here.
Sue