H2O2 for many things as others have posted. Been using it since my parents taught me all that it does.
I’ll add-
Use liberally on a q-tip to clean the inside of your nose.
Melts out the nasties.
“Use liberally on a q-tip to clean the inside of your nose.
Melts out the nasties.”
I use a Neti pot with salt and a drop of 2% food grade peroxide.