If you mean a simple two-ingredient drink to soothe mucus and a congested throat, there isn’t a recipe proven to literally “clear” mucus from the lungs. Your lungs normally remove mucus through coughing and the airway’s natural clearance mechanisms.
A gentle option is:
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Warm water + honey — honey can soothe an irritated throat and may reduce coughing, particularly with an upper-respiratory infection. It doesn’t cure the infection or remove mucus from the lungs.
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Drink plenty of fluids — staying hydrated can help keep mucus less thick and easier to cough up.
Avoid honey for children under 1 year old.
If mucus lasts more than a few weeks, keeps recurring, or comes with shortness of breath, chest pain, high fever, wheezing, or blood in the mucus, seek medical care.
