The water in the ditch is not very clean.

沟里的水不很清洁。

《新英汉大辞典》

These cups are not very clean.

这些杯子不太干净。

youdao

Artificial rust-removing expenses low, some local processing is not very clean.

人工清砂费用低，有些局部处理的不是很干净。

youdao

Unfortunately, knowing what the clean version--knowing what the word is means to me the clean version is not very clean.

很遗憾,在知道了和谐版的歌词之后,我发现和谐版也不怎么和谐

耶鲁公开课 - 心理学导论课程节选

Unfortunately littered plastic bags are a common sight in Jordan and 30% of tourists complain that tourist sites are not very clean.

UNESCO: Communication and Information

With no sanitation facilities, essentially, very little clean water and not much food, everybody is desperate to rebuild the small homes that they had and get back to them.

NPR: U.S. Gets Mixed Signals on Helping Myanmar

They were not clean-cut at all, very messy, and I thought there was going to be an upset - the Georgians were a bit unlucky in the end.

BBC: Zinzan Brooke column