I have one. They are great! Helps reduce snoring. Helps you breathe easier. No drugs, no ten syllable chemicals, no side effects.
Get the one that looks like a little watering pot. Let gravity do the work and be sure to keep your head down so you don’t pour it down your throat. The squirt bottles are more likely to plug your ears.
CVs/ Walgreen’s etc carry them under the name Sinu-clease. They make premade packets of ‘salts’ to add to the warm water so you don’t over/under salt.