How Often Should Solar Panels Be Cleaned?

How Often Should Solar Panels Be Cleaned?

Solar panels are a smart investment. They save you money, reduce your carbon footprint, and increase your home's energy efficiency. But to keep them performing at their best, regular maintenance is key—especially when it comes to cleaning.

So the big question is: How often should solar panels be cleaned?
 Let’s break it down.

Why Clean Solar Panels at All?

Solar panels work by capturing sunlight. But when dirt, dust, pollen, bird droppings, and even leaves cover the surface, they block sunlight and reduce efficiency.

Studies show that dirty solar panels can lose up to 20–30% of their energy output—which means less savings for you.

Ideal Cleaning Frequency

1. Every 6 Months (Recommended)

Most homeowners should aim to clean their solar panels twice a year—once in the spring and once in the fall. This schedule helps clear off winter grime and fall debris, ensuring panels are optimized during peak sunlight seasons.

2. Quarterly for Dusty or Polluted Areas

If you live near:

  • Farmlands
  • Construction zones
  • Industrial areas
  • Windy/dry climates (think deserts)

You may need quarterly cleaning to prevent dust buildup from cutting performance.

3. After Heavy Storms or Wildfire Seasons

Always inspect your panels after:

  • Strong winds (which can blow dirt or branches)
  • Heavy rain mixed with pollution (which can leave residue)
  • Wildfire season (ash buildup can coat panels fast)

If you see visible residue, it’s time for a clean—even if your regular schedule isn’t due yet.

Signs It’s Time to Clean Your Solar Panels

  • Noticeable drop in energy production
  • Dust or dirt visible from the ground
  • Tree sap, bird droppings, or heavy pollen buildup
  • Streaks or smudges blocking light

Don’t wait until production drops—routine maintenance keeps your investment working for you.

Can I Clean My Solar Panels Myself?

Technically, yes. But it’s not always safe—or effective. Panels are usually located on rooftops, and DIY cleaning can be risky without the right tools or experience.

Professionals:

  • Use purified water and solar-safe brushes
  • Avoid scratching the surface
  • Know how to spot damage or performance issues
  • Are trained to work safely on roofs

The Bottom Line

Clean your solar panels at least twice a year, or more frequently if your environment causes faster buildup. It’s a small step that makes a big difference in performance, longevity, and energy savings.

Let the Sun Shine In—Book a Cleaning Today!

At Big Bear Window Cleaners, we specialize in safe, professional solar panel cleaning that maximizes your energy output and protects your investment.

Back to blog