🌧️ Does Rain Really Clean Your Solar Panels?
Many people believe rain cleans their solar panels. It helps a little, but not enough. In most of San Diego County, rainwater leaves behind dust, minerals, and spots that actually reduce solar output.
💧 Why Rain Alone Isn’t Enough
Rain rinses away some loose dirt, but it also leaves behind:
Hard water spots that block sunlight
Mud streaks that dry onto the glass
Bird droppings, pollen, and soot that bake on under the sun
After a recent storm, we cleaned systems in Fallbrook, Vista, and Escondido.
Even after heavy rain, the panels were still coated in grime — the difference after cleaning was dramatic. (See photo: showing how much dirt was removed after the rain.)
⚡ The Real Impact on Energy Production
Even a light layer of residue can cut production by 20–30%.
When panels stay dirty, they simply don’t generate as much power.
On commercial systems in Oceanside, Carlsbad, and San Marcos, we often see performance gains of 10–15% right after a professional wash.
That means:
More energy for your business or home
Better long-term return on investment
Full protection of your panel warranties
Clean panels are efficient panels — and that’s money back in your pocket.
🧽 What Professional Cleaning Does Differently
At The Solar Cleaners, we don’t rely on plain water. Instead, we use filtered water and TÜV-rated Sunbotics and SunBrush systems for a spotless result.
Our methods are safe for:
Residential rooftops in Encinitas, Rancho Bernardo, and Poway
Commercial carports and ground mounts in El Cajon, Chula Vista, and Kearny Mesa
Because we use the right tools and techniques, panels dry streak-free and without mineral residue. In contrast, rainwater can actually create more buildup over time.
🌤️ The Best Time to Schedule Cleaning
Timing matters. In San Diego County, it’s smart to clean panels:
After spring pollen and summer dust
After any major rain, when spots start forming
Before fall, when shorter days reduce sunlight hours
By staying ahead of buildup, your system stays efficient year-round.
🤝 Proudly Local and Trusted
We’re proud members of the Fallbrook Chamber of Commerce — serving both homeowners and business owners across the county.
To learn more, visit our Solar Maintenance page or explore other blog posts about solar care, maintenance, and performance.
✅ Key Takeaways
Rain doesn’t truly clean your solar panels.
Mineral spots and dirt block sunlight.
Professional cleaning boosts energy output.
We serve all of San Diego County, from Fallbrook to Chula Vista.
The Solar Cleaners — keeping your panels clean, efficient, and performing at their best.
#solarmaintenance #sunbrush #sunbotics #renewables #sandiegosolar #cleanenergy