I've used it twice now when I felt a cold coming on (sore soft palate that starts to creep down your throat). Both times Xlear knocked it out over night. I'm not claiming it will cure covid, but it's a good first response.
I have the nasal wash and the nasal spray. Neither dries out the nasal passages...quite the opposite. That being said, when you have an infection brewing, your nasal passages and sinuses are going to be more tender.