Solar Panel Warranty Cleaning Requirements — What Manufacturers Actually Demand

Australia has over 4.2 million rooftop solar installations. Each of those systems comes with manufacturer warranties — typically a 10–12 year product warranty and a 25–30 year performance warranty. These are substantial coverage commitments worth $5,000–$15,000 per household.

What most solar owners don’t know is that those warranties come with maintenance obligations. Get cleaning wrong, and you may find yourself with a warranty claim denial when you need it most.

How Warranties Reference Cleaning

Most solar panel warranties contain a section on “Care and Maintenance” or “Operating Conditions.” This section typically states:

1. Panels must be kept reasonably clean
2. Cleaning must be performed using approved methods and materials
3. Damage resulting from improper cleaning is excluded from warranty coverage
4. Panel performance expectations assume panels are maintained in accordance with guidelines

The specific language varies by manufacturer, but the principle is consistent: the warranty assumes you’re doing your part.

What Australia’s Major Manufacturers Require

LG Solar (LG Neon, Bifacial Series)

LG’s installation and maintenance manual specifies:

• Clean with soft cloth or soft brush and clean water only
• Distilled or deionised water strongly recommended
• Never use detergents containing solvents, abrasives, or acid
• Avoid cleaning when panels are hot (thermal shock risk)
• Pressure cleaning not recommended

LG’s performance warranty explicitly excludes degradation resulting from “inadequate cleaning or soiling damage.”

SunPower (Maxeon Series)

SunPower’s maintenance documentation states:

• Use purified or deionised water with a soft-bristle brush
• Never use ammonia-based, abrasive, or strongly alkaline cleaners
• High-pressure water blasting voids warranty coverage
• Clean during cooler parts of the day only

Canadian Solar

Canadian Solar’s maintenance guide specifies:

• Clean with water and a mild, non-abrasive, non-detergent cleaner or water only
• Pressure washing is not recommended
• Avoid cleaning in freezing temperatures or extreme heat
• A soft cloth or brush is required — no abrasive materials

Jinko Solar

Jinko’s documentation covers:

• Deionised or purified water with mild neutral detergent if needed
• No acids, alkalis, or organic solvents
• No high-pressure washing
• Clean early morning or evening to avoid thermal shock

REC Solar

REC specifies:

• Clean with clean water and a non-abrasive cloth or brush
• Distilled or deionised water preferred to avoid mineral deposits
• No acid, alkaline, or abrasive cleaners
• Clean outside peak temperature hours

Tier-1 Chinese Manufacturers (JA Solar, LONGi, Trina, Risen)

Most tier-1 Chinese manufacturers follow similar guidelines to the above:

• Deionised or purified water preferred
• Soft brushes or cloths only
• No abrasives, solvents, acids, or ammonia
• No high-pressure washing
• Thermal timing requirements

The Performance Warranty: Where Cleaning Matters Most

The performance warranty — which guarantees your panels will produce at least 80% of rated output after 25 years — is the coverage most likely to be affected by cleaning practices.

Here’s why:

Soiling-related performance degradation pathway:

1. Panels are chronically under-cleaned
2. Particulate soiling (dust, bird droppings, pollen) embeds in the AR coating
3. Biological growth (lichen, algae) establishes and etches glass
4. Long-term output falls below the performance warranty threshold
5. Homeowner makes a performance warranty claim
6. Manufacturer inspects panels, identifies soiling damage and biological etching
7. Manufacturer declines claim under “failure to maintain” provisions

This is not a hypothetical scenario. It’s a documented pattern in Australian warranty disputes.

Protecting Your Warranty: Practical Steps

1. Know Your Panel Brand and Model

Start by knowing exactly what panels you have. Check your original installation documentation or look at the panel label (usually on the back frame). If you can’t find it, your installer or your CEC accreditation certificate will list the equipment.

2. Download the Manufacturer’s Maintenance Manual

Go to the manufacturer’s website and search for your panel model’s “installation and operation manual” or “maintenance guide.” These are usually free PDFs. Print or save the cleaning section.

3. Maintain a Cleaning Record

Keep receipts from professional cleaning services. For DIY cleans, keep a simple log noting the date, products used, and what you observed. If you ever make a warranty claim, this documentation demonstrates that you’ve met your maintenance obligations.

4. Use Warranted Products Only

Stick to deionised water and soft brushes. If you want to use a commercial solar cleaner, contact your manufacturer to confirm it’s approved — or check whether the cleaner manufacturer provides a list of compatible panel brands.

5. Don’t Pressure Wash

Every major manufacturer either explicitly prohibits or strongly advises against pressure washing. The risk of panel micro-cracking, seal damage, and AR coating disruption from pressure washing is real — and it’s one of the most common causes of warranty claim disputes.

Installation Warranty vs Performance Warranty

It’s important to distinguish between two types of warranty:

Product/Materials Warranty (typically 10–12 years): Covers manufacturing defects, material failures, and premature physical degradation. Cleaning-related damage claims under this warranty usually require proof of damage caused by an incorrect cleaning method.

Performance/Power Output Warranty (25–30 years): Guarantees the panel will produce above a certain output threshold. This is where chronic under-maintenance creates the biggest warranty risk — accumulated soiling damage that permanently reduces output may not be covered if the manufacturer can point to a failure of maintenance obligations.

For Australian consumers, the Australian Consumer Law (ACL) provides an additional layer of protection — consumer guarantees that may apply even if manufacturer warranty is declined. However, the ACL’s “reasonable care” expectation still requires that you’ve maintained the product appropriately.

Key Takeaways

• Know what your warranty requires before cleaning — download the manual
• Use deionised water and soft brushes — this is universally safe across all major brands
• Never pressure wash — no major manufacturer approves it
• Keep cleaning records — crucial for any warranty claim
• Annual professional cleaning typically satisfies maintenance obligations for most manufacturers

Your solar panels are a significant investment protected by valuable warranty coverage. Following the manufacturer’s cleaning requirements costs almost nothing extra — and protects thousands of dollars in coverage.

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Related: What Voids a Solar Panel Warranty? · Pressure Washing Solar Panels · Solar Panel Cleaning Cost