To keep the inside working parts of your engine clean, use engine oil and fuel that have tested engine cleaning properties.

为保持引擎内部工作部件的清洁，使用经检测具有清洁引擎性能的机油和燃料。

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Scrub the glass, working at all angles to clean the edges.

用力搓洗玻璃，注意要多角度清洁各个边角。

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Scrub the glass, working at all angles to clean the edges. Make sure to cover every square inch of the glass.

用力搓洗玻璃，注意要多角度清洁各个边角。保证每寸玻璃都擦到。

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The non-profit organization's projects include working to provide communities with clean drinking water.

VOA: special.2009.05.04

It's not surprising that creative performers bristle at being labeled, even if being accused of working clean doesn't sound so harsh.

WSJ: Jim Gaffigan Is the King of (Clean) Comedy

When he was infected, he was working clean-up detail.

CNN: An anthrax survivor looks back

Rudy Socha, CEO of the group Wounded Nature-Working Veterans plans to have several hundred volunteers working to clean beaches on Jamaica Bay next week.

WSJ: SC group to help clean beaches hit by Sandy