A pot of mouse excrement spoils a pot of soup.

Rat shit spoils a pot of porridge. Its similar poem should be: a rotten fish, a pot of soup. A bad explosion point will pollute the surrounding environment. For example, there is a scum in a good team, which will affect the image of the whole team. There is another sentence, that is, I am a little reluctant to make a big mistake. These are all sentences with similar meanings.