Why Cleaning LG Solar Panels the Right Way Actually Matters

Cleaning LG solar panels the wrong way can cost you more than a dirty roof — it can permanently damage your system, void your warranty, and quietly drain your energy output for years.

Here’s what you need to know upfront:

LG’s own guidance is clear: residential solar arrays are designed to be virtually maintenance-free under normal conditions, and rain alone handles light dust if panels are tilted at least 10 degrees. But real-world soiling — pollen, bird droppings, road dust — doesn’t always play by those rules. And in the North Chicagoland area, where spring pollen seasons hit hard and trees shade rooftops in suburbs like Northbrook, Glenview, and Wilmette, buildup happens faster than most homeowners expect.

The stakes are real. A landmark study by researchers at UC San Diego tracked 186 California solar sites and found a 7.4% efficiency loss after just 145 days without rain or cleaning. A 2026 study from Fraunhofer CSP tested five commercially marketed solar panel cleaning products and found that three of them caused permanent output reductions — up to 5.6% — by chemically damaging the anti-reflective glass coating. In other words, cleaning with the wrong product can make your panels perform worse than if you’d left them dirty.

I’m Damir Bakh, owner of VECO Window Washing and Gutter Cleaning, and our team has hands-on experience with exterior surface care — including cleaning LG solar panels on residential rooftops across Chicagoland — where getting the tools, water chemistry, and safety setup right is non-negotiable. In this guide, I’ll walk you through exactly what to do, what to avoid, and when to call a professional.

Why Cleaning LG Solar Panels is Essential for Performance

To understand why keeping your solar panels clean is so vital, you have to look at how they generate electricity. LG solar modules, such as the NeON series, are engineered with high-efficiency photovoltaic cells protected by a layer of tempered glass. This glass is treated with an anti-reflective coating that maximizes the amount of sunlight reaching the silicon underneath.

When dirt, dust, pollen, and environmental grime build up on that glass, they form a physical barrier. Over time, this barrier acts like a permanent shadow over your array, directly choking your system’s output. To ensure you are getting the full return on your green energy investment, routine care is essential. Learn more about professional maintenance options on our solar panel cleaning page.

The Impact of Soiling on Energy Output

In the solar industry, the accumulation of dirt, leaves, bird droppings, and pollen is officially known as “soiling.” While a light layer of dust might only cause a minor drop in generation, heavy soiling can severely impact your wallet. According to the International Energy Agency’s Photovoltaic Power Systems Programme, soiling causes an average annual energy loss of 4% to 7% globally. In dust-heavy, coastal, or agricultural regions, individual systems can lose up to 15% to 25% of their total generation every year if left uncleaned.

But efficiency loss isn’t the only concern. Severe, localized dirt — like a thick patch of bird droppings — can trigger more technical issues. When a single cell or a small string of cells is completely shaded by debris, it can activate the system’s bypass diodes. This means a tiny spot of stubborn grime can drag down the performance of an entire string of panels.

Furthermore, in humid conditions, conductive dirt on the glass surface can contribute to a phenomenon known as Potential Induced Degradation (PID), which causes permanent power loss. In short, regular cleaning does not just boost your monthly energy generation; it actively protects the internal electrical components of your system from premature wear.

How to Detect a Soiling Problem

You do not need to climb onto your roof with a magnifying glass to figure out if your panels are dirty. In fact, we strongly discourage doing so! Instead, the smartest way to check is by monitoring your system’s performance.

If you have an LG solar array, you can use an online portal or monitoring application (like LG’s EnerVu portal) to track your daily production. Here is how to spot a soiling problem from the safety of the ground:

• Compare Historical Data: Compare your system’s output over the last seven clear, sunny days to the exact same period from the previous month. If you notice a performance drop of 3% to 5% or more under identical weather conditions, soiling is the likely culprit.
• Check for String Anomalies: If your monitoring app allows you to view individual panel or string-level performance, look for any single string that is underperforming compared to the others. This often indicates localized debris, like leaves or bird droppings, on a specific section of the array.
• Watch for Inverter Startup Delays: Extremely dirty panels can sometimes delay your inverter from turning on in the morning. In some cases, wet, conductive grime on the electrical connections can even trigger a RISO (insulation resistance) fault alarm, which homeowners often mistake for a hardware failure when it is actually just a dirty system.
• Perform a Visual Ground Inspection: Grab a pair of binoculars and look at your roof from your lawn. If you can clearly see a dull, hazy film, dark streaks, or bird droppings on the glass, it is time for a wash.

Safe Methods and What to Avoid When Cleaning LG Solar Panels

When it comes to cleaning LG solar panels, the golden rule is simple: treat the glass with the same gentle care you would use on a high-end camera lens. The anti-reflective coating on your panels is highly sensitive, and using the wrong tools or water can permanently ruin its texture, scattering light instead of absorbing it.

Step-by-Step Guide to Cleaning LG Solar Panels Safely

If your panels are easily accessible from the ground or a secure platform, and you choose to clean them yourself, always follow this step-by-step procedure to keep both yourself and your equipment safe. For more technical background on safe, eco-friendly washing practices, check out our guide on eco-friendly window cleaning.

1. Read the Manufacturer Guidelines First: Before starting, always consult the official documentation. You can read the official LG recommendations on How to Clean Solar Modules | LG USA to understand their specific safety boundaries.
2. Shut Down the System: Never clean hot, active solar panels. Shut down the entire system using your rapid shutdown switch or solar inverter breaker. Note: Even when shut down, the panels and wiring still carry live electrical voltage, so never touch any exposed wires or connections.
3. Choose the Right Time: Only clean your panels in the early morning (before 8:00 AM) or late evening (after 5:00 PM), or on a completely overcast day. This prevents the panels from being hot to the touch.
4. Dry Brush First: Use a soft-bristle brush or a clean, dry microfiber duster on a telescoping pole to gently sweep away loose leaves, twigs, and dry dust. This prevents you from turning dry dirt into abrasive mud when you add water.
5. Rinse with Low-Pressure Water: Use a standard garden hose with a gentle spray or shower nozzle. Gently wet the panels from top to bottom.
6. Apply a Mild Soapy Wash (If Needed): If stubborn spots like bird droppings remain, use a highly diluted mixture of mild, biodegradable dish soap and water. Apply it using a soft sponge, non-woven fabric, or a dedicated solar cleaning brush. Never use standard kitchen sponges, as the abrasive scrubbing side will scratch the glass.
7. Final Rinse and Squeegee: Rinse the panels thoroughly with de-ionized or distilled water to prevent mineral spots. Use a soft rubber squeegee on an extension pole to wipe away water trails and let them air dry.
8. Turn the System Back On: Once the panels are completely dry, switch your inverter back on and monitor your app to verify your output recovery.

Prohibited Cleaning Products and Chemical Risks

It is tempting to grab whatever cleaning spray is sitting under your kitchen sink, but doing so can be an incredibly expensive mistake.

A 2026 study conducted by the Fraunhofer Center for Silicon Photovoltaics (CSP) tested five commercially available solar panel cleaning products. The researchers discovered that three of the five products caused permanent output reductions of up to 5.6% due to chemical attacks on the anti-reflective glass coatings.

To protect your system’s warranty and performance, strictly avoid the following:

• No Harsh Chemicals: Never use bleach, ammonia, alcohol, vinegar, or highly alkaline cleaners. These chemicals strip the anti-reflective coating and can degrade the silicone seals surrounding the panel frame.
• No Abrasive Tools: Avoid steel wool, wire brushes, abrasive scouring pads, or stiff-bristle brooms. These will leave micro-scratches on the glass, permanently reducing light transmission. For a comparison of abrasive vs. non-abrasive exterior cleaning, see our guide on soft washing for windows.
• No Standard Tap Water (If High in Minerals): Standard municipal or well water contains dissolved minerals like calcium and magnesium. When tap water evaporates on a hot solar panel, it leaves behind hard water spots (calcium carbonate). Over time, these mineral deposits bake onto the glass, scatter sunlight, and become incredibly difficult to remove. If you must use tap water, ensure you squeegee it off completely, or use a de-ionizing water filter.
• No “Self-Cleaning” Sprays: Many miracle sprays marketed online are what solar professionals call “snake oil.” They often leave behind a microscopic polymer film that actually attracts dust and pollen faster than untreated glass.

For detailed technical specifications on approved cleaning agents for high-quality silicon modules, you can review the This manual is suitable for cleaning guide.

The Dangers of Thermal Shock and Pressure Washers

Two of the fastest ways to destroy a solar array are thermal shock and high pressure.

Thermal shock occurs when cold water is sprayed onto hot solar panels. On a sunny afternoon in Arlington Heights or Buffalo Grove, your solar panels can easily reach temperatures exceeding 130°F. If you spray them with cool water from a garden hose, the sudden, extreme temperature drop causes rapid thermal contraction. This intense physical stress can instantly shatter the tempered glass or create microscopic cracks in the silicon solar cells underneath, permanently ruining the module.

Pressure washers are equally destructive. While pressure washing is fantastic for concrete driveways, it should never be used on solar equipment. High-pressure water streams can:

1. Shatter the tempered glass cover.
2. Force water past the watertight rubber seals of the aluminum frame.
3. Penetrate the junction box underneath the panel, causing dangerous electrical short circuits.

To protect your system, always keep water pressure below 3,000 Pa (or under 100 PSI, which is typical for a standard home garden hose). For more on safe pressure management, check out our power washing options, and read How to Clean Solar Panels — Safe Methods for Maximum Output | LONGi Solar Solutions for more on safe pressure standards.

Professional Maintenance vs. DIY: Safety and Regional Factors

While the physical process of washing a panel seems straightforward, the environment in which solar panels live makes DIY cleaning a highly risky task for the average homeowner.

When to Hire a Professional for Cleaning LG Solar Panels

LG Electronics officially and strongly discourages solar panel owners from cleaning their own arrays due to the severe safety hazards involved. Working on a roof combines two major dangers: heights and high-voltage electricity.

• Fall Protection: Most residential solar panels in Chicagoland suburbs like Evanston, Skokie, and Oak Park are installed on steep, multi-story asphalt shingle or tile roofs. Climbing a ladder while carrying heavy extension poles, hoses, and squeegees is a recipe for a dangerous fall. Professional crews are fully trained in OSHA safety standards and utilize specialized safety harnesses, anchor points, and roof ladders.
• Electrical Hazards: Solar arrays are live electrical systems. Even if you shut down your inverter, the panels themselves continue to generate high-voltage direct current (DC) as long as there is light hitting them. If a panel has an undetected crack or a damaged wire, introducing water can create an active path for electrical shock.
• Professional Equipment: Professional cleaning services use specialized, truck-mounted water purification systems. These systems produce pure, de-ionized water with zero dissolved solids (0 PPM). This pure water acts like a magnet for dirt, dissolving stubborn pollen and dust without the need for harsh chemical soaps, and dries completely spot-free without squeegeeing.
• Warranty Protection: If you slip and crack a panel frame, or scratch the glass during a DIY clean, the physical damage is not covered by your warranty. Hiring a fully insured, certified professional ensures your investment remains completely protected.

For a deeper look at the advanced equipment professionals use to safely clean high, hard-to-reach glass surfaces, see our guide on innovative facade glass cleaning methods. You can also learn about our specialized low-pressure washing techniques on our soft washing services page, or read the comprehensive Solar Panel Cleaning Guide | SurgePV for more on professional standards.

Managing Snow, Ice, and Chicagoland Weather

Living in Northern Illinois means dealing with heavy winter snow, freezing rain, and ice storms. Homeowners in places like Libertyville, Vernon Hills, and Lake Forest often worry when they see their solar panels completely covered in snow.

Here is the professional consensus on winter solar care: let the snow melt naturally.

Modern solar panels are incredibly durable. In fact, standard IEC qualification testing ensures they can handle heavy mechanical loads (often up to 5,400 Pa, which is equivalent to about four feet of heavy, wet snow).

Because solar panels are dark and installed at an angle, they absorb heat quickly. As soon as the sun emerges, a thin layer of meltwater forms underneath the snow pack, causing the snow to slide off the slick glass surface in large sheets.

Attempting to scrape snow or ice off your panels with a shovel, roof rake, or broom is highly discouraged. You risk scratching the anti-reflective coating, striking the frame, or damaging the delicate panel-to-panel electrical connections.

However, you should keep an eye on your gutters and the roof space directly beneath your solar array. When massive sheets of snow slide off the panels, they can pile up in your gutters, creating heavy ice dams that can back up under your shingles. Safely clearing snow and ice dams from your gutters and lower roofline using a telescopic rake is a smart preventative measure.

For more tips on preparing your home’s exterior for harsh Midwestern winters, read our exterior house cleaning guide. You can also check the official Tongwei Solar PV Module Cleaning Instructions for industry guidelines on winter maintenance.

Frequently Asked Questions About Solar Panel Maintenance

Maintaining your home’s green energy system often raises a few common questions. Here are the answers to the questions we hear most frequently from homeowners throughout the Chicagoland area. For general glass maintenance tips, visit our window cleaning services page.

How often should LG solar panels be cleaned?

For most residential systems in temperate climates, we recommend having your solar panels professionally cleaned every 12 to 18 months.

However, your local environment plays a massive role in this frequency. If your home in Palatine, Mount Prospect, or Highland Park is surrounded by mature oak or pine trees, you will experience heavy spring pollen and falling leaves, which may require cleaning twice a year (once in late spring after the pollen dump, and once in late autumn).

The tilt of your panels also matters. If your array is installed at an angle of 10 degrees or more, gravity allows natural rainfall to wash away light dust and loose dirt. But if you have a flat-roof system or a very low-tilt array, water will pool on the glass, leaving behind muddy rings when it evaporates, requiring more frequent manual cleaning.

Will cleaning my solar panels void the manufacturer warranty?

No, routine cleaning will not void your warranty, provided you follow the manufacturer’s approved methods. However, using high-pressure washers, abrasive cleaning pads, or unapproved chemical solvents can void your coverage if they cause physical or chemical damage.

It is also important to address a common question regarding LG solar panels specifically: LG officially closed its global solar panel manufacturing business. Despite exiting the solar market to focus on other energy sector platforms, LG continues to fully honor all existing limited warranties for installed systems.

If you ever need to make a warranty claim or have questions about your existing LG modules, you can contact your original installer or reach out directly to LG Customer Support at 1-833-388-2121. Be sure to keep all your original installation paperwork and records of professional maintenance, as this documentation supports any potential warranty claims.

How much does professional solar panel cleaning cost in Northbrook, IL?

When considering the cost of professional solar panel cleaning in Northbrook, IL, and the surrounding North Shore suburbs like Winnetka, Deerfield, or Glenview, pricing is determined by several general factors rather than a single flat rate.

Because every home is unique, professional services evaluate:

• The Size of the Array: The total number of panels in your system.
• Roof Pitch and Accessibility: Steep, multi-story roofs that require advanced fall-arrest gear, specialized ladders, or extra-long water-fed poles require more time and safety preparation than simple, low-pitch ranch homes.
• The Severity of Soiling: Arrays with heavy, baked-on bird droppings, moss, or thick tree sap require extra care and specialized, gentle scrubbing tools compared to systems with just a light layer of seasonal dust.

Investing in professional care ensures your system continues to operate at peak efficiency, maximizing your monthly utility savings and protecting your equipment for its entire lifespan.

Conclusion

Your LG solar panels are a high-performing, long-term investment designed to provide clean, reliable energy for decades. But just like any other exterior surface exposed to the unpredictable Midwestern weather, they need occasional care to perform at their absolute best. By keeping them clear of pollen, dust, and bird droppings, you ensure that every ray of sunshine is successfully converted into power for your home.

At VECO Window Washing and Gutter Cleaning, we take the hassle and danger out of maintaining your home’s exterior. Whether you live in Northbrook, Arlington Heights, Evanston, or anywhere across the North Chicagoland area, our team is equipped with the specialized tools, pure de-ionized water systems, and safety gear needed to clean your solar array safely and effectively.

Ready to restore your system’s peak performance without risking a climb onto your roof? Visit our solar panel cleaning service page to request a free, personalized consultation today!