Chinese medicine external cleansing formula usually need to choose a good container, you can choose casserole or stainless steel pot, can not use iron pot, and then the container placed in the drug with the right amount of water decoction can be. Chinese medicine external cleansing formula can usually prepare a good large capacity containers, such as pots or cauldrons, and then put the drug in the first 5 to 10 pounds of water to soak for half an hour to 1 hour, and then heating, because the need for external cleansing, so the water is recommended to be added more. When heating, you can first use the fire to heat and boil and then use the fire to decoct for about 20-30 minutes, the decoction process should be covered with a lid to prevent water evaporation. After the decoction is done, strain the dregs and rinse the exterior with water. When using the herbal external cleansing formula, it is recommended to wash for 15~20 minutes each time so that the medicine can be fully absorbed, and the liquid after washing can be stored first and then saved for the next use.