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, I 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 manual I've read agrees: Regular cleaning maintains efficiency, prevents permanent damage, and protects your warranty. Manuals universally 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. Each guideline below is a paraphrase of the manufacturer's published cleaning direction from their installation or warranty manual, cited so you can look it up yourself. If your specific brand isn't listed, I check its manual before every job.
1Top Residential Brands
Tesla
Premium US“Clean your solar panels at least once a year to maintain optimal performance.”
Source: 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.”
Source: 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.”
Source: LG Solar Installation & Maintenance Manual
- Inspect and clean panels at least annually
- Remove bird droppings promptly - acidic damage occurs quickly
- Use non-abrasive tooling and a manufacturer-matched surfactant only when 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.”
Source: Panasonic HIT Panel Care Instructions
- Monitor your system for unexpected production drops
- Clean with soft, non-abrasive tooling and clean water only
- Avoid cleaning during peak sun hours (thermal shock risk)
Panasonic recommends monitoring your energy production — a sudden drop often indicates an equipment or soiling issue worth checking.
Silfab Solar
Premium US“Regular cleaning helps protect your investment and supports stronger production.”
Source: Silfab Solar Maintenance Guide
- Use non-abrasive tooling 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.”
Source: 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.”
Source: 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.”
Source: 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.”
Source: 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.”
Source: 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.”
Source: 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.”
Source: 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.”
Source: 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.”
Source: 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.”
Source: 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.”
Source: 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 I Follow These Guidelines
Solar Alchemist matches its method to each panel manufacturer's published cleaning instructions.
Deionized Water
Pure water leaves zero mineral deposits, maximizing light transmission.
Non-Abrasive Tooling
Manufacturer-matched contact tooling that won't scratch protective coatings.
No Pressure Washing
I never use high-pressure systems that can damage seals and coatings.
Cleaning that follows your panel manufacturer's published rules.
Every major panel maker publishes cleaning guidelines in their installation and warranty manuals. When you clean the way they ask, you keep the paperwork on your side, so if you ever have a warranty question, a resale inspection, or an insurance conversation, the answers are boring.
Rule 1 · Water Quality
Every manual we've read asks for pure water without minerals, deionized or distilled, so the panel dries without leaving a film. Tap water in Southern Wisconsin runs 18–22 grains per gallon; that's the film manufacturers are warning against.
I rinse with 100% deionized water. Every visit.
Rule 2 · Soft Contact
Manufacturers universally prohibit high-pressure washing and abrasive pads. The published methods use soft brushes or microfiber applied at low pressure. That's the exact tooling I bring, matched to the manufacturer of the panel I'm cleaning.
No pressure washers. No walking on your glass.
Rule 3 · Cool Glass
Every guide asks you to clean when the glass is cool, morning, evening, or overcast, to avoid thermal shock. I schedule around temperature, not just around the calendar.
Cool panels, always. Cloudy days encouraged.
Rule 4 · A Paper Trail
Warranty documentation, resale inspections, and property insurance conversations all get easier when there's a dated record showing your panels were cared for the way the manufacturer asked.
Every visit ships with timestamped before-and-after photos and a service log.
What This Means for You
Cleaning your solar panels shouldn't create a warranty question.
When I'm done, you have clean panels, a service log, and photos, and nothing in your warranty paperwork changes. That's the whole idea. If you own a home, a farm, or a commercial building, keeping your maintenance boring is one of the quiet ways your investment stays yours.
Start Your Service RecordCommercial, Agricultural & Government
Procurement teams and PPA contracts speak the same language.
PPA operations & maintenance clauses and property insurance underwriting often ask for documented, manufacturer-aligned cleaning. I provide EIN/W-9, itemized service logs, and timestamped photos sized for procurement records. $2M general liability in place.
Separate from your panel warranty, many installer production guarantees also require documented proof of cleaning and maintenance before they’ll pay out on an underperformance claim — check your installer contract, not just your manufacturer’s warranty. See Solar Insure’s breakdown of production-guarantee gaps or the citation on our sources page.
Request a commercial quoteGeneral educational information, not legal or insurance advice. Manufacturer guidelines vary by brand and model, always confirm the cleaning method for your specific panels against the manual that came with your system.