being clean是正在被清洁的意思，被动语态，而cleaning则是清洁动词的现在分词，表示现在在清洁，例如

Process workers are cleaning the whole factory, each machinery being cleaned and sanitized. 工艺工人正在清洁整个工厂，每台机器都被清洁和消毒。

Being clean为动宾结构，意为“变得干净”;而cleaning为动词的现在进行时，意为“正在打扫卫生”