MQD, this method is quite effective. However, it can be harsh. You will likely cough. I get the water to barely steaming, put the drops in (just a couple), and then huff it like a skid row bum huffs paint.
In another vein, I’ve made a chlorine dioxide solution (CDS) in a nasal sprayer. Normally I’d use a homemade Xlear (xylitol) spray, but I was out of xylitol. The diluted CDS spray seems to do as good a job as Xlear and probably better. While Xlear is an excellent prophylactic, the CDS can be a prophylactic AND a remedy. We call it “Snoot”.
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