How to wash knives in Tianlong Babu 2

Sweat, wash the knife 1. There is a word "hang" on the right of the couple in Suzhou. As you can see on the map, in that NPC, wash a knife with 5J plus 2000 good and evil! 2. Buy Qingxin Dan at YB store, one for 60YB. 3. Staying in the wild scene without blinking an eye will kill a knife for an hour, and so on. If you are Tianshan Mountain, suggest the third method, others suggest the first method.