I use the Niel rinses regularly; saline only - no steroids. Too much steroid treatment = damaged sinus tissue, exacerbated symptoms, inability to tolerate or benefit from steroid or synthetic steroid nasal treatment. Overprescription (prior to covid) did that to me. Post-COVID the post-nasal drip and overproduction of mucous became immediately worse - increasing NAC 600's to 2x/day worked.
Do your own reesearch or check with a doc; I started with one NAC to help with post nasal and sinus issues, and now take one PM to help nighttime post-nasal drip/sleep interruption issues, and one AM to get through the day, wheeze and nasal drainage-free. You'll likely discover, as I did, that you can get by with far less antihistamines if constant mucous isn't in your passageways as a constant irritant - triggering a histamine storm response, in which the body to says, "Irritants in airways! Send antihistamines!"
My bronchiectasis disappeared, three years into COVID, with NAC 2x day. NAC is another remedy that most docs aren't hip to.