A good and fast way of getting rid of mucus that is in your throat is to gargle some warm salt water.
Get a cup of warm water and then ad some salt to the warm water and then take a sip of the warm salt water and then begin gargling with the warm salt water.
The gargling of the warm salt water helps to clear the phlegm of that is at the back of your throat and then you should be able to cough out the phlegm
To use the warm salt water to clear your throat of mucus you mix a cup of warm water with 1/2 to 3/4 teaspoon of salt.
The salt water can help to soothe a sore throat and kill germs in your throat and mouth as well so it's a good way to treat the mucus as well as the sore throat and get rid of the germs.
Drinking some warm tea can also help and you can also add some honey to it as well.