Do not clean your solar panels with abrasive chemicals. You should use some lukewarm water, a soft cloth and some biodegradable soap if needed. Clean your panels at least once a month or more frequently if you notice your green energy system is not producing as much power as it should.
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Think about the money that you send to your power companies each month. How would you like to keep that money in your pocket? Changing to solar power will do that for you. After you pay off the initial investment, the money you used to pay to the power company will stay in your wallet.