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While it may seem that your solar panels are always affixed to your roof permanently, the best ones permit repositioning of the angles. Fixed angle panels are just not that efficient.
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.