#Energy 
When someone gets a new rooftop solar installation, the second question they always ask is "how often do I need to clean my solar panels." We'll answer that question on today's show — taking into account the different effects of rain, dust and electric rates (BTW, the first question people always ask is "how do I read my electric bill;" but that's a topic for another show).http://ift.tt/1ttPZHm http://bit.ly/15KdByZ
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