Keep your inner space clean.

保持你内心的清净。

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Elegant appearance makes the space clean and pretty.

优雅的外型可以让空间显得整洁、美观。

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Keep the space clean and, lastly, try not to open the doors too often.

保持储藏室的干净，不要经常开门。

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Tech Nation is a reader friendly explanation of the stakes playing out in the clean tech space.

FORBES: Clean Tech Nation: The Scramble for Clean Tech Supremacy

The experts also stated that the international community needed to sort through the myriad legal issues that would currently frustrate attempts to clean up space.

BBC: 'Urgent need' to remove space debris

There are lots of ideas out there to clean up space.

BBC: Space debris: Time to clean up the sky