An emulsion of liquid coconut oil, boiled water, vitiman C and xyitol
MSM and Zantac (the old OTC tummy med) is about the least irritating
set
of things that you can use to rinse your nose out with.
Find a concentration of each that feels good to you and is soothing.
you can also add just a drop of peppermint.

Roughly
4 ozs boiled water
1 tbs xyitol
2 gms Vitiman C
2 Zantac
1 gram MSM (methyl syphonal methane)
1 oz liquid coconut oil (the white solid stuff is also good to swab
into your nose, as it is liquid at body temp, but you don't want that
in your irrigation equipment.)

Disolve the xyitol and vitiman C, zantac and MSM in the hot water.
Put the coconut oil
in a clean blender and add the water a little at a time while
blending
to finely mix the oil and water.
If you have done it right it won't seperate, but depending on the
exact composition of the
oil it my want to seperate if it cools very much, so use it warm.
Use it before it seperates and clean
your equipment with Dawn and rinse really well.
twice a day at least 3 hours before bed, because otherwise the
crawling sensation of the film pulling loose interfers with trying to
sleep.

Use Vitiman C  in your mouth, let it diffuse into your sinuses,
sniff,
sniff, sniff, spit spit spit to clean out an airpath before bed.
Dannon's "Immunity" can be used in the same way.

Wear a mask as much as practical to heat and humidify your nose. The
bad bugs don't like heat.

Hum an hour a day.