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People can also cause a blockage when they try to clean out their ears, but only push the wax deeper inside.

VOA: special.2010.03.31

When making yogurt, it is very important to have clean equipment, clean hands and good temperature control.

VOA: special.2009.01.19

When baby teeth begin to appear, you can clean them with a wet toothbrush.

VOA: special.2009.03.11

This low capital approach has run into difficulties when applied to clean energy as nicely detailed in this Harvard Business School review.

FORBES: Why Venture Capital Is Weak Fuel For Clean Energy Startups

There is the opportunity that actions we take to deal with that challenge present to us economically when it comes to clean energy and developing domestic energy alternatives to the import of foreign energy.

WHITEHOUSE: Press Briefing

And one of the most popular elements of it has been a clean energy manufacturing initiative that will put Americans to work while helping America gain the lead when it comes to clean energy.

WHITEHOUSE: New Investments in Jobs and Clean Energy