How often should you clean solar panels? Facts and myths about PV maintenance

Facts and Myths About PV Maintenance

Photovoltaic installations are a long-term investment. Although solar panels are generally low-maintenance, regular upkeep—especially cleaning—has a real impact on the efficiency and lifespan of the entire system. There are, however, many myths surrounding this topic. Is rain enough to keep the panels clean? How often should they be washed? Is it safe to do it yourself? Below, we clear up the most common doubts.

🧴 Myth 1: “Rain will wash everything away”

Rain certainly helps, but it’s not enough. While it removes some dust or leaves, it doesn’t eliminate greasy residues, bird droppings, chimney soot, or mineral deposits. These types of dirt have the biggest impact on panel performance and must be removed mechanically or chemically—using dedicated cleaning agents.

📅 Fact: Cleaning once or twice a year is the optimal minimum

For most households, the recommended frequency is 1–2 times per year:

• Spring, after winter (deposits, pollen, dust, urban pollution)
• Autumn, after summer (insects, resins, smog)

In high-dust areas (near roads, industrial zones, or farmland), consider cleaning every 3–4 months.

🔍 Myth 2: “Dust and dirt don’t significantly affect efficiency”

Even a thin layer of dust can reduce panel efficiency by 5% to even 20%. With heavier contamination (e.g., bird droppings, rain streaks), energy production can drop by up to 30%, and long-term neglect may even lead to cell damage.

🧼 Fact: Household detergents can be harmful

Avoid using window cleaners, vinegar, or soapy water. Common cleaners may contain abrasive particles, foaming detergents, or alcohol that leave streaks or accelerate surface degradation.

Instead, use dedicated products like Simpura PP Pure Power, which:
✔ leave no streaks
✔ have antistatic properties
✔ are safe for glass and panel coatings

🛠 Can you clean solar panels yourself?

Yes—provided you follow safety guidelines:

• Do not climb onto the roof without proper protection
• Avoid using pressure washers
• Clean only during low sunlight (morning or evening) to prevent thermal shock

For large installations or hard-to-reach areas, consider professional cleaning services.

Summary

Regular PV panel cleaning is not a luxury—it’s a real necessity that translates into higher efficiency, longer lifespan, and a faster return on investment.
Take care of your panels just like you take care of your car—they, too, need a good wash from time to time.