Protect Your Solar Warranty
Improper cleaning can void manufacturer warranties on systems that cost $20K–$200K+. Whether you own a home, run a commercial facility, or manage a government property, we follow the official cleaning guidelines from 15+ major manufacturers — so your investment stays protected.
Universal Manufacturer Guidelines
Never Pressure Wash
All manufacturers explicitly prohibit high-pressure washing. It damages seals, coatings, and can crack glass.
Avoid Hot Panels
Never clean when panels are hot. Cold water on hot glass causes thermal shock and microcracks.
Use Pure Water
Deionized or distilled water prevents mineral deposits that reduce light transmission.
Clean Early or Late
Morning, evening, or overcast days are ideal. Panels should be cool to the touch.
The Industry Consensus
Every major manufacturer agrees: Regular cleaning maintains efficiency, prevents permanent damage, and protects your warranty. They all warn against DIY pressure washing and most recommend professional cleaning services—especially for roof-mounted systems.
All Major Manufacturers
Tap a tier to jump to manufacturers you care about. Every guideline below comes directly from the manufacturer's official cleaning documentation.
1Top Residential Brands
Tesla
Premium US“Clean your solar panels at least once a year to maintain optimal performance.”
— Tesla Solar Panel Care Guide
- Use soft materials only - no abrasive cleaners
- Avoid high-pressure water systems completely
- Clean during cool hours to prevent thermal shock
Tesla specifically warns against pressure washing and recommends professional cleaning services for safety.
SunPower / Maxeon
Premium US“Do NOT go onto your roof for panel cleaning. Contact a professional instead.”
— Maxeon Official FAQ & SunPower Maintenance Guidelines
- Professional cleaning strongly recommended over DIY
- Regular cleaning improves energy output up to 25% in dusty areas
- Use deionized or distilled water to avoid mineral deposits
Maxeon (SunPower's panel manufacturer) explicitly states homeowners should NOT clean panels themselves due to safety risks.
LG Solar
Premium“Periodic cleaning is essential to maintain the rated power output of your solar system.”
— LG Solar Installation & Maintenance Manual
- Inspect and clean panels at least annually
- Remove bird droppings promptly - acidic damage occurs quickly
- Use non-abrasive materials and mild soap if needed
LG emphasizes that bird droppings can cause permanent hot spots and cell damage if not cleaned promptly.
Panasonic
Premium“Clean panels when soiling is visible or production drops below expected levels.”
— Panasonic HIT Panel Care Instructions
- Monitor your system for unexpected production drops
- Clean with soft cloth and clean water only
- Avoid cleaning during peak sun hours (thermal shock risk)
Panasonic recommends monitoring your energy production—a sudden drop often indicates cleaning is needed.
Silfab Solar
Premium US“Regular cleaning helps protect your investment and supports stronger production.”
— Silfab Solar Maintenance Guide
- Use soft brush or cloth with clean water
- Avoid abrasive materials that can scratch glass coating
- Clean in early morning or evening when panels are cool
Silfab, a leading North American manufacturer, recommends professional cleaning for hard-to-reach installations.
REC Group
Premium European“Regular maintenance including cleaning helps ensure system longevity and performance.”
— REC Panel Maintenance Documentation
- Visual inspection and cleaning at least annually
- More frequent cleaning in dusty environments
- Use purified water to prevent residue buildup
REC includes professional cleaning in their recommended annual maintenance checklist for optimal long-term production.
2Major Global Manufacturers
LONGi Solar
World #1 Manufacturer“Clean with soft, non-abrasive materials while the inverter is turned off for safety.”
— LONGi PV Panel Cleaning Instructions
- Turn off inverter before cleaning for electrical safety
- Clean in morning, evening, or on cloudy/rainy days
- Avoid shading during cleaning (causes hot spot effects)
LONGi, the world's largest panel manufacturer, specifically warns that cleaning during peak sun can cause thermal shock damage.
JinkoSolar
World #2 Manufacturer“Periodic cleaning of modules is necessary to maintain optimal power generation.”
— JinkoSolar Module Care Guidelines
- Clean when dust, leaves, or debris accumulate
- Use soft materials and clean water only
- Avoid cleaning in direct sunlight when panels are hot
JinkoSolar recommends annual professional cleaning for all residential systems to maintain warranty coverage.
Trina Solar
Top 3 Global“Regular cleaning maintains efficiency. Clean at least annually or when soiling is visible.”
— Trina Solar Maintenance Documentation
- Clean at least once per year minimum
- Adjust frequency based on local soiling conditions
- Use soft, non-abrasive cleaning materials
Trina Solar notes that soiling losses can exceed 25% in agricultural and high-dust environments.
Canadian Solar
Top 5 Global“Avoid corrosive cleaning solutions. Use lukewarm water with a microfiber cloth.”
— Canadian Solar Maintenance Guidelines
- Never use hydrofluoric acid, alkali, acetone, or industrial alcohol
- Use lukewarm water with soft microfiber cloth
- Clean during cooler parts of the day
Canadian Solar specifically prohibits harsh chemicals including acetone, alkali, and industrial alcohol.
JA Solar
Top 5 Global“Consistent cleaning practices help maintain rated power output throughout system life.”
— JA Solar Module Maintenance Guide
- Clean at least annually or more in dusty areas
- Use soft brushes and clean, mineral-free water
- Avoid cleaning during hot afternoon hours
JA Solar recommends deionized water to prevent mineral deposits that reduce light transmission.
Q CELLS (Hanwha)
Top 5 Global“Soiling can significantly impact module performance. Regular cleaning is advised.”
— Q CELLS Installation & Operation Manual
- Clean panels with soft brush and water
- Avoid harsh chemicals and abrasive tools
- Spring and fall cleaning recommended
Q CELLS emphasizes that soiling losses can exceed 20% and recommends bi-annual cleaning in most climates.
REC Group
Premium European“Regular maintenance including cleaning helps ensure system longevity and performance.”
— REC Panel Maintenance Documentation
- Visual inspection and cleaning at least annually
- More frequent cleaning in dusty environments
- Use purified water to prevent residue buildup
REC includes professional cleaning in their recommended annual maintenance checklist for optimal long-term production.
First Solar
Utility Scale Leader“Module cleaning frequency should be determined by site-specific soiling assessments.”
— First Solar O&M Best Practices
- Conduct soiling loss assessments to determine cleaning schedule
- Use demineralized or deionized water
- Soft rotating brushes or manual methods recommended
First Solar, specializing in thin-film technology, emphasizes site-specific cleaning schedules based on actual soiling data.
3Inverters & Optimizers
Enphase Energy
Microinverter Leader“Keep panels clean and free of debris to ensure optimal microinverter performance.”
— Enphase System Maintenance Guide
- Dirty panels reduce power output to microinverters
- Regular cleaning maintains system efficiency
- Monitor production through Enphase app for anomalies
Enphase monitoring can detect production drops from dirty panels—use your app to know when cleaning is needed.
SolarEdge
Optimizer Leader“Regular panel maintenance ensures optimizers can deliver maximum power to your system.”
— SolarEdge System Care Guide
- Panel-level monitoring shows when individual panels underperform
- Dirty panels create uneven system output
- Regular cleaning prevents optimizer strain
SolarEdge's panel-level monitoring can pinpoint exactly which panels are dirty and underperforming.
How We Follow These Guidelines
Solar Alchemist uses the exact methods recommended by every manufacturer listed above.
Deionized Water
Pure water leaves zero mineral deposits, maximizing light transmission.
Soft Brush System
Professional-grade soft bristles that won't scratch protective coatings.
No Pressure Washing
We never use high-pressure systems that can damage seals and coatings.
Your Homeowner's Insurance Can Deny a Claim for Neglected Panels.
Most homeowner's policies cover solar panels for sudden, accidental damage — hail, fire, fallen branches. They do not cover damage tied to neglected maintenance. Cleaning is maintenance.
The standard ISO HO-3 homeowner's policy explicitly excludes loss caused by:
“Wear and tear, deterioration, inherent vice, and neglect.”
— ISO HO-3 Section I, Exclusions (the dominant policy form used by most U.S. insurers)
Insurance Information Institute
“Homeowners are expected to perform routine maintenance on their property. Insurers may deny claims if damage is the result of neglected upkeep.”
Source: III – Solar Panels & Homeowners Insurance →NAIC · Duty to Mitigate
Every state's insurance code includes a “duty to mitigate” clause — you, the insured, must take reasonable steps to prevent damage. Failure to maintain panels can be cited as a breach.
Source: NAIC – Homeowners Insurance Topic Page →Major Carriers
State Farm, Allstate, and Liberty Mutual all include neglect & lack-of-maintenance exclusions in their standard residential policies. Adjusters routinely cite these to reduce or deny claims when long-term soiling is documented.
Industry-standard policy language — verifiable in your own declarations page.
Solar Industry Reporting
Specialty solar policies — and an increasing number of standard policies — now require documented annual professional cleaning as a condition of full coverage on rooftop PV systems.
Source: EnergySage – Solar & Homeowners Insurance →What Protects You
A simple paper trail of professional cleanings.
Every Solar Alchemist visit comes with timestamped before-and-after photos and a service record. If you ever need to file a claim, you have proof that you upheld your maintenance obligation. That's the difference between a denied claim and a paid one.
Start Your Maintenance RecordCommercial & Government Properties
Your property insurance and performance bonds care about this too.
Commercial property policies (the standard ISO CP 10 forms) carry the same neglect exclusion. PPA contracts and government performance bonds often require documented annual O&M including module cleaning. We provide Certificates of Insurance, EIN/W-9 documentation, and itemized service logs sized for procurement teams — the same package the Wisconsin State Capitol used.
Request a commercial quoteThe above is general educational information, not legal or insurance advice. Coverage and exclusions vary by carrier and policy. Always review your own homeowner's policy declarations and exclusions, or contact your agent directly to confirm what your specific policy covers.