Tips to reduce mucus in lungs?

Does anybody have ways to reduce mucus in lungs? A bit of background: Currently using Advair and Spiriva. I am also a competitve runner and mucus builds up very quickly in my lungs when running and need to huff cough to get it out. My Ventolin does absolutely nothing to relieve symptoms. Mucus also builds up at rest, slower then when running, even if I am nose breathing 100%.

So is their any food, daily practices I should take or do to reduce that mucus? Its really bothering me because when I run my races after 15min of very intense running I lose like 30% of my lungs capacity and cannot fully breath but can still continue to run but harder to keep the pace. Liike I said Ventolin or any immediate relief meds does nothing