★★★★★
It really depends on how deep-seated the phlegm is in your lungs. I had similar problems after covid-19, but my phlegm always gathered in my throat and bronchial area, which I was always clearing. To waste no time, I will immediately describe what helped to resolve my own phlegm predicament that was so similar to yours.
The first thing that I would recommend is Ted from Bangkok's old remedy for reducing phlegm in the chest/throat regions. This is a simple but effective remedy: Every morning, on an empty stomach, you should supplement a half teaspoon of sea salt in a glass of water then immediately drink another glass of water afterwards. The extra salt in the blood will automatically act to pull out and reduce any excess liquid phlegm from the nasal passages, from the throat/bronchials region and form the intestines.
The second worthwhile protocol that I would suggest for you is that you buy a standard nebulizer(not the small hand held type -- the larger one with a proper nose/mouth mask) and just nebulize a 1% hydrogen peroxide solution for 15 to 20 minutes twice a day. I normally just use a proper portable medical nebulizer and I use store bought 3% hydrogen peroxide(HP) but would not recommend that you use 3% HP strength since some people can be sensitive to nebulizing 3% hydrogen peroxide right off the bat. Using the proper medical nebulizer with a full mask is a must and is particularly useful because not only will it help disinfect the lungs and nasal passages but it will also kill any bacteria/fungi/viruses that tend to hide or breed in the large nasopharanx cavity(NPC) area that is situated directly behind the nose, thereby causing a build up of phlegm in the NPC which, I have found, always constantly drips that mucus from the upper NPC region onto the throat and bronchial regions(especially at night! ), thus causing continual clearance problems. I found that using a nebulizer with hydrogen peroxide was the most effective for disinfecting ALL affected regions, including the lungs, throat, nose and NPC. After all, if all these regions continually contain excess mucus, this, perhaps, would indicate an untreated and infected region that definitely needs disinfection and clearance.
You could also perhaps use a simple neti pot with 1% saline to help clear the nose and nasopharanx regions of phlegm.
And, particularly for the lungs, I would supplement all the B vitamins and supplement regular daily doses of N-Acetylcysteine(600 mg twice a day), Selenium(200 mcg once or twice a day) and Resveratrol(500mg twice a day) -- always taken at mealtimes.
