I’m a total convert. I don’t use a neti or flush/rinse, I prefer the aerosol saline spray ($8 at any pharmacy, over the counter, sounds dear but lasts a long time!). It’s effectively the same thing though.
I encountered it when I was directed to use it following sinus surgery, to fight infection and keep everything well moisturized. In the days following, I used it 10+ times a day! I found it to be the bomb.
My surgeon had pointed out that years of bad sinus’s meant I had pretty entrenched sinusitis, notoriously difficult to completely get rid of. But this saline spray did the job within a couple of months it was gone without a trace, never to return.
Now I use it whenever I get any kind of congestion, and I haven’t had a sinus infection since.
(Caveat - it is imperative that the nozzle be sterilized after every single use, or you’re just reintroducing the infection to your sinus cavity.)
Another really helpful thing I learned from the surgeon is the value of apple cider vinegar. It seems there is something in apple skins that helps thin mucus. It’s concentrated in the vinegar. One half ounce, a couple of times a day, thins the mucus and your sinus drains and your body gets the upper hand and you get over your cold really fast. Bonus it will clear your clogged sinus’s within minutes of ingesting!
If I’d known about these two things 20 years ago I’d have saved a small fortune in over the counter cold and sinus meds, plus have avoided innumerable colds, sinus infections and blinding sinus headaches. Quite possibly even surgery.