Yes. Even a thin layer of dust or pollen can reduce solar panel output by 5–10%, and heavier buildup can cause even more loss.
Common Types of Buildup
– Pollen & Dust: Common in spring and summer
– Bird Droppings: Organic matter blocks UV rays
– Algae & Mold: Can grow in humid, shaded areas
– Hard Water Stains: Caused by roof runoff or irrigation
What the Research Shows
Multiple studies confirm that solar panel efficiency drops as buildup increases. A clean panel absorbs more light and produces more power—plain and simple.
Is Rain Enough?
No. Rainwater leaves behind mineral deposits and doesn’t remove organic buildup. To keep your panels efficient, professional cleaning is a must.
More helpful tips at elevationpowerwashing.com
Pressure Washing FAQs 
Leave a comment