some people use some kind of diluted hydrogen peroxide in a nebulizer. no idea if it is really safe.
The worst thing that could happen if you nebulized a small amount of diluted whiskey (ethyl alcohol) is you get slightly drunk.
btw, if you do get Covid ..do the breathing with a spirometer. YOu dont even need one to have the same effect.
I recently had a pulimonary breathing test. I passed it fine but I had to stop in the middle of it because I was coughing up so much clear phlegm.
The guy told me that was common to see during the test.
If I'd start coming down with any kind of respiratory infection, I'd breathe in vapors of oregano essential oil. I'm pretty sure it has antiviral, antibacterial, and antifungal properties.
A few years ago I started coming down with a respiratory issue that felt like it was going to be a real bad one. I was headachy, fatigued, congested, and had to sit up in bed and cough, cough, cough to try to loosen the phlegm. I took a couple of aspirins and a swig of Robitussin DM. Then I put three or four drops of oregano essential oil on a scrap of paper towel every few hours, with the piece of paper towel hung in front of a small fan to disperse the vapors throughout my bedroom. The logic was to get the potential cure down to where the infection seemed to be by breathing in the vapors and getting them down into my bronchial tubes and lungs. Within 18 hours I was 100% symptom free. To make sure it was completely whipped, I kept the paper towel replenished with oregano oil for a couple of days after the symptoms were gone.
If I'd start coming down with something I thought might be Covid, I'd probably also put a little oregano oil on a piece of cloth that I could hold a little closer to my face, in order to get a more concentrated dose of the medicinal effects. It's pretty potent though, so I wouldn't ever hold the cloth right up by my face. A couple or three feet away would be close enough.