While normal dust and grime can wash off solar panels with enough incline, this can build up over time and reduce efficiency which costs you money. Bird dropping and leaves are the biggest issue when it comes to solar panels and these can quickly build up. According to Royal Flush Facilities Management you could be leaving 35% more energy on the table if you don’t clean your panels in just 2 years.
Therefore we recommend a clean once a year for most customers. Certain panels and location may need more regular cleaning.