Pez, God Bless You. I had COVID Augus of 2022 and I am battling the same thing. I was diagnosed with Long COVID this past July. I am awaiting to see a Pulmonologist in October. I have this mucousy thick saliva in the back of my throat every day. Sometimes at night I get choked on it. I have tried everything....prescription & natural. The COVID clinic said that COVID had attacked my gut, acid reflux, joints & lungs and hince backup in my throat. The only thing that gives me temporary relief is irrigating my sinuses daily, salt water rinse in my mouth and Azelastine (SP?) (prescription antihistamine) daily & Cromalyn Spray which works a little differntly (over the counter). I do find that eating anything really salty makes it worse. I scrape my tongue several times a day to get this stuff off. Once I get the morning stuff cleared out, it helps, but, builds back up during the day. I take Guaifenisin 600 mg mucous thinner sustained released 12 hour (over the counter) in the a.m. and before bedtime which helps. I am taking a probiotic (Mega sporebiotic...it's very potent so you have to start slow.....Amazon) to hopefully put some good flora back in my gut due to all the antibiotics/steroids I was on for COVID pneumonia, asthmatic bronchitis & sinus infection. I clear my throat constantly. I drink lemon ginger tea which does seem to help for a little while. I drink water to help thin out the mucous. I went to 5 doctors about this and one of them cultured my mouth and it came back normal mouth bacteria. I had an endoscopy done in May due to so much reflux (Long COVID again) and he said all looked normal and there was no candida in the esophagus. I was thrilled about that as I had a lot of thrush after all the antibiotic and steroids. I personally think my gut is playing a big part in this from all the meds AND COVID wrecked havoc on the mucosa in my mouth. I was told to not eat citrus fruits by the COVID clinic as that could make mucosy saliva worse. My immune system is not good....I am going to an Integrative Medicine doctor who thinks he can help me with this and getting IV infusions to boost my immune system. I too use a humidifier & hepa filter (2 in the house due to allergies). This summer was incredily hot and humid and I had pneumonia again, asthmatic bronchitis again & sinus infection again for about 2 1/2 months. Never had a summer like this until I had COVID last year, although. I will say the humidity was the worst here this summer and it aggravated upper respiratory. Please consult with doctor before trying any of these. Praying for you and all us COVID long haulers that this stuff will wear itself out. Doctors are not there yet with treating COVID and are learning as this is new and everyone that has had COVID reacts differently. God Bless You and I am sorry you are battling this. I empathize.