Humidifier, baby shampoo, water
Wasn't bunged up really, it was more a tightness across my chest, and when I breathed in all the way, I found I could breath out only ~70% before breaking into the dry cough. (70% = Subjective, I didn't measure it)
I'm not sure about things like Olbas Oil, I don't want an irritant in the lungs, I want a surfactant to break the virus down. So the idea is to find a surfactant that has the *minimum* irritation and known to work on Covid. An irritant tends to inflame causing a cough to clear your lungs, but that's not the mechanism I'm after. I had no problem coughing, it was that the cough wasn't clearing any mucus or clearing my lungs, its just a dry deep cough getting in the way of breathing.
The baby soap caused a big cough cough cough, 3 chunks of white mucus. After an hour the tightness had receded and I found (again subjective) ~85% capacity before the cough kicked in.
The wife tried it too, she had the wheeze and dry cough, hers wasn't as successful, I suspect she doesn't trust me enough to deep breath soapy air! She barely took any breaths of it.
I have a new strategy now: I've bought humidifiers, the cold ultrasonic kind, and switched to baby shampoo after reading a research paper on how baby shampoo is a cheap and readily available source of sinus friendly surfactants. I'm wary of Sodium Lautheth Sulfate in the baby wash.
You humidify whole rooms with surfactant and moist air, the virus cannot survive in that air, hopefully. Every surface is coated with surfactant to break down virus on any surface. Every nook and cranny has surfactant in it.
You create a Covid unfriendly environment.
If you have no problem with the milder surfactant, you stay in the room and can breath it in and it should also work within the lungs (not verified). If you have a problem with it, then you can leave the room, humidify the room, switch off the humidifier before using the room. Then at least you have surfactant everywhere.
The missus doesn't trust me with my BKC 0.1%, or even 0.02% (i.e. 1ml per 5 litres of humidifier water), but she tolerates the slight smell of baby shampoo everywhere in the house. Even though that's an unwanted ingredient.
Baby's dry cough has cleared up, but then she's a baby with her own batch of lung soap, so that's to be expected anyway.
My lungs now give me the 85% with a wheeze, but no cough at the last 15% which I consider to be an improvement. Still a slight tightness.
Or perhaps I have something else and simply getting over it anyway using the bodies immune system. None of the above is a substitute for actual medical help/guidance.