Maybe you're supposed to use it with shower gel.

也许你应该将它与沐浴露一起使用。

They're small plastic fragments less than 5mm in size. You find them in cosmetic products such as facial scrubs, shower gel, and toothpaste.

它是一种大小不超过5毫米的塑料粒子。磨砂膏、沐浴露和牙膏之类的化妆品中常含有这种物质。