I've been boiling salted water, putting a towel over my head and inhaling the fumes, done twice today and it seems to do some good immediately after. I imagine it's similar to what nasal spray does.
When you feel the scratchy throat, a frequent salt gargle helps too.
This recent post had an interesting nebulized hydrogen peroxide treatment https://poal.co/s/QStorm/505271
Garlic - if you don't mind smelling like a spicy sausage for a bit https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7673072/
Gargles with dental hydrogen peroxide solution works awesome too. There's also iodine for gargles that works very well, but I haven't seen that sold in the US.
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