Rooftop solar panels get dirty primarily from wind-blown dust and pollen. Birds are usually not a problem unless your last name is Hitchcock and you live in Bodega Bay. As panels get dirtier, their output declines. A small amount of soiling — say a light dusty film — may only cause a 5 percent output decline. However, when panels get very dirty — perhaps in an agricultural area or location that does not get regular rainfall — the output decline can be greater than 20 percent.

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When should I clean my gutters

Clean gutters of leaves and debris to help prevent damage to your landscaping and siding, and to head off expensive water damage repairs to your foundation that may cost £1000s or more. 

Clean gutters at least once a year — twice a year if you have overhanging trees. Also, clean clogged gutters after big storms.

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