这是我从ChatGPT和google得到的：

问：Is salad washed before packaging?

ChatGPT回答：It depends on the manufacturer, but pre-packaged salads are often washed before packaging to reduce the risk of foodborne illness. However, it is recommended to wash the greens again before consuming.

Google：If you've ever grown lettuce or been in a field of it, you know that greens grow pretty close to the ground, and they can have a hefty amount of dirt on them. So producers wash their greens before they bag them. "Many pre-cut, bagged, or packaged produce items are pre-washed and ready-to-eat," according to the FDA.