The correct way is to fill the pig's lungs with water, let it expand, and then squeeze out the water forcibly, which needs to be repeated many times, so that the dirty things inside can be discharged more effectively.
Until the water boiled from the pig lungs turns white, then you can cut the pig lungs into pieces and clean them with running water. If you buy it and cut it into pieces for cleaning, it won't wash.
Prepare a clean pot, add water, put the pig lungs in it, and cook it with strong fire, so that the blood in it can be removed. After cooking, take out the pig lungs, add water, and wash them repeatedly, so that they can be washed more cleanly. Wash the cooked pig lungs in cold water, so that some floating foam can be removed by using the principle of expanding with heat and contracting with cold, and then they can be washed more cleanly after repeated washing.
To clean the pig's lungs more cleanly, first put the pig's lungs on the tap, and then squeeze out the water after the large and small blood vessels are filled with water. It needs to be repeated many times until the lungs turn white, then knead them with some white vinegar and salt, put them in a pot and boil them to soak out the dirty things inside.
Then wash it again until it turns white, and then put it in the pot to cook. Add some water and bring the fire to a boil. There is a lot of blood foam at this time. Turn off the fire after boiling and discoloring, then pour it out and rinse it with clear water. Generally, after these procedures, pig lungs can be cleaned.