Solar panel cleaning costs $10 to $20 per panel or $150 to $500 total on average for most average residential solar systems. Some companies include an inspection in this price, while others charge a separate inspection fee. If problems surface during the cleaning or inspection, you may be looking at additional repair costs ranging anywhere from $20 to $3,000+, depending on the issue.

Solar panel cleaning takes 1 to 3 hours on average for a typical residential solar system. Cleaning a larger-scale solar panel system, one with panels that are difficult to access, or one with extensive debris accumulation may take longer.

Most solar panels need cleaning. Accumulated debris on the panels can reduce their energy output by 7% to 30%+ over time. However, whether and how often you should clean your solar panels depends greatly on your geographic location and the local weather conditions. If you live in an area that experiences frequent rain, your solar panels may not require cleaning as often as those in drier climates.

Solar panel cleaning usually makes a difference, especially if you live in a dry or dusty area, or an area where other environmental conditions cause your panels to accumulate dust and debris quickly. Keeping your solar panels clean makes a difference by extending their lifespan, preventing stains, and ensuring they perform at their optimal efficiency.

There are several different cleaning methods when it comes to solar panels:

• Manual – Manual cleaning is the most common method for residential solar panel systems. Pros typically use a water-fed, non-abrasive brush with deionized water, which soaks up the dirt and prevents streaks on the panels. For tougher residue, professionals may also use a scraping tool designed for safely removing residue from solar panels.
• Automation and robotics – Cleaning solar panels using automated or semi-automated robots is a popular method for cleaning large-scale solar systems. These devices often use microfiber cloths and controlled airflow to remove dirt. Some models use water-fed brushes, and some come with both wet and dry cleaning options.
• Waterless vibration – Vibration technology for solar panel cleaning is a relatively new trend. This method is great for areas with limited access to water. The process involves using electrostatic repulsion to causes dirt and debris to shed off the panel without needing water or soap.

Solar panel manufacturers typically include detailed cleaning instructions, some going as far as to specify the proper hardness level of the water. Always confirm your solar panel cleaning professional is aware of and follows the manufacturer guidelines to ensure your warranty remains valid.

No. You should not use glass cleaner on solar panels. Most solar panels contain at least one protective coating. Glass cleaners, window cleaners, Rain-X, and comparable products may degrade these coatings, which can result in lower efficiency and a shorter lifespan.

Most professionals recommend scheduling a solar panel inspection and cleaning at least once or twice a year. Your solar panels may need more frequent cleaning if you live in an area with a lot of trees or one with excessive dust, extreme weather, or a lot of pollution.

Scheduling an inspection and cleaning after a major weather event will ensure your solar system is free of debris and working as efficiently as possible.

Solar panel systems are not cheap. To protect your investment and ensure you're choosing the best solar panel cleaning service near you, be sure to:

• Look for active members of the North American Board of Certified Energy Practitioners (NABCEP), the Solar Energy Industries Association (SEIA), and the American Council on Renewable Energy (ACORE).
• Looks for solar panel cleaning pros with high ratings on HomeGuide and Google.
• Compare 3 to 5 inspection and cleaning quotes with similar details.
• Hire a licensed, bonded, and insured professional who has been in business for 5+ years.
• Get a detailed contract and warranty in hand before the work begins.
• Beware of extremely low bids that can indicate low-quality work or lack of industry expertise.

Asking the right questions will help you choose a qualified solar panel cleaning professional whose cleaning method aligns with your panels' manufacturer warranty terms:

• How long have you been cleaning solar panels?
• What solar panel or related training, certifications, or licensing do you have?
• Do you have a list of references from past customers or a website with testimonials?
• Does the estimate include both an inspection and cleaning?
• What cleaning method do you use?
• Will your cleaning process void my panels' warranty?
• What extra costs might surface when you're cleaning the panels?
• How long will the inspection and cleaning process take, and should I be home for it?