The word "cleaning" refers to the process of removing dirt, dust, or any unwanted substances from a surface or object to make it tidy and free of impurities. Full definition
This new milestone exploring the use of clean energy in one of the largest transportation sectors could mean positive impacts on the global goal to reduce CO2 emissions. (earthday.org)
It will provide you with clean energy for the day and is so easy to make. (thehealthytart.com)
The same could happen for green chemistry, as a demand for cleaner products drives innovation. (scientificamerican.com)