In order to prevent diseases need to clear mud and other debris in the sink.

为了预防疾病，需要清除水槽中的污泥等杂物。

youdao

It was only when the hull was hanging freely from the lifting frame, clear of the seabed and the suction effect of the surrounding mud, that the salvage operation progressed to the second stage.

只有当船体从升降架上自由悬挂，脱离海床和周围泥浆的吸力作用时，打捞工作才进入第二阶段。

youdao

Oh well, that's all as clear as mud, then.

哎呀，那么一来这真是成了一本糊涂账了。

《牛津词典》

This week leaves the rest of his thinking as clear as mud.

ECONOMIST: Man overboard

The sea which used to be clear blue was like mud water and it was as if it was boiling up and gaint waves were coimng on to the land.

CNN: Tsunami tragedy: Your e-mails

In the case of Heriberto Lazcano, responsible for some of the most gruesome crimes in Mexican history, it seems pretty clear that he died face-down in the mud in the city of Progreso, meaning Progress.

BBC: Heriberto Lazcano: The fall of a Mexican drug lord