Anyway, you don't have to! ! ! Just like plastic cups, scientists say that high-density polyethylene (HDPE) is non-toxic and has little impact on people from the current use situation (whether it is high-density polyethylene or not), but many cups are made of other toxic materials instead of HDPE. However, Jiuyang is definitely afraid to use materials that scientific research shows are toxic, so don't worry about it. Isn't the black rubber washer on the nose part (the top of the blade bar) leaning against the metal cup? I remember that my soymilk machine was not soaked. No big problem.