I had that for years as well. Though not totally gone now, it is massively lessened-I can put full sentences together without having to try to clear my throat. I never found a remedy except, ugh-that awful word, time.

I have been using a cool mist humidifier set up on a barstool at my bedside. It mists about 2feet above my face & helps keep my nose&sinus mucus looser. I can cough& nose blow in morning to easier clear the mucus.

That thick mucous you can scoop out with your hands is bad. I ended up prescribed an inhaler that gave me a little relief in the coughing I had because of it. Maybe ask your doctor.