In order to clean the bottom floor of engine room, the hot and cold fresh water pipes and cocks to be installed from engine control room to bottom floor.

为清洁机舱底部，从机控室到底部地板应装热水和冷水管和旋塞。

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She would clean the house from top to bottom.

她会彻底地打扫房子。

《柯林斯英汉双解大词典》

Before the Spring Festival, every family would clean their houses from top to bottom.

春节前，家家户户都会彻底打扫房屋。

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They clean the bottom of a boat.

VOA: special.2010.05.16

We were also impressed with the incredibly clean bottom panel which, while incredibly difficult to photograph, does hide the required pile of stickers and licensed keys that usually pollute the laptop's exterior.

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"We've got to really clean house here and get to the bottom of what's been going on, " she said Friday.

NPR: CIA Concedes It Destroyed Al Qaida Tapes

Sludge settles to the bottom, leaving clean water on top.

FORBES: Muckraker