Hi Nick - It is great to see your suggestions, and herbal teas can be very helpful in thinning mucus.
However, a bronchoscopy is a potentially risky procedure that is normally used as a diagnostic tool, not an infection treatment. Are you possibly talking about bronchial lavage, which is sometimes used to try to wash out infected sputum?
Daily airway clearance, with or without saline nebs, is a much less invasive way of keeping infection away.
Sue