Tips On How to Clean Solar Panels: 4 Harmful Factors


How to Clean Solar Panels

Learn how to clean solar panels with our comprehensive guide, including tips for specific brands and types to boost efficiency and lifespan.

Are your solar panels not performing as efficiently as they used to? It might be time for a sparkling clean. Cleaning your solar panels is essential to maintenance, but many homeowners are unsure. 

Regular cleaning is essential to maintain the optimal performance of your solar panels (PV). Use a soft brush or sponge with mild detergent to gently clean the surface. Avoid abrasive materials and high-pressure water to prevent damage.

Inspect for debris or shade obstruction that may impact sunlight exposure. If panels are challenging to access or heavily soiled, consider hiring professionals for thorough cleaning.

Do I have to clean my solar panels?

Yes, cleaning your solar panels regularly is advisable to prevent the build-up of dust, dirt, and debris that can lower their efficiency. By following the manufacturer’s guidelines, you can ensure proper cleaning techniques without causing damage and maximize the energy output of your panels.

What Affects Solar Panels

Bird Droppings

Bird droppings can significantly impact the efficiency and performance of solar panels. These droppings contain chemicals that, when exposed to sunlight, can form stubborn stains on the surface of the panels.

These stains reduce the sunlight that can reach the solar cells and attract pests such as insects and rodents. To ensure optimal performance, regular cleaning is essential to remove bird droppings from solar panels.

Various methods for cleaning solar panels are available, including using water, a soft brush, sponge, or specialized cleaning products formulated for solar panels. By regularly cleaning your solar panels and keeping them free from bird droppings, you can maximize their energy production and maintain their efficiency.

Pollen and Leaves

Pollen and leaves can be significant obstacle to the optimal performance of solar panels. Blockage of sunlight due to the accumulation of pollen and leaves on panels can reduce their efficiency. Springtime brings pollen from blooming plants, making it a critical period for cleaning.

Similarly, autumn brings falling leaves, which can hinder the panels’ performance, especially if trees are nearby. To ensure the panels function at their best, regular cleaning is necessary to remove pollen and leaves. Using appropriate cleaning techniques and equipment is crucial to prevent any damage to the panels’ surface.

Dust and Dirt

Dust and dirt can accumulate on the surface of solar panels, leading to a decrease in their efficiency. This is especially common in dry and dusty environments or areas with high pollution levels. Along with dust, other sources of dirt, like bird droppings, leaves, and debris, can also hinder the performance of solar panels.

To maintain maximum efficiency and energy output, it is crucial to clean solar panels regularly. Using a soft brush or sponge, along with non-abrasive cleaning solutions, will help remove any dirt or buildup without causing damage to the panels.


Water is a crucial factor that can impact the cleanliness and efficiency of solar panels. While rainwater can help rinse off dirt and debris, it can also leave behind mineral deposits and streaks on the panel’s surface. If the water used for cleaning has impurities or is hard, it can lead to residue buildup.

Moreover, bird droppings and organic matter carried by rain can cause unpleasant panel stains. Therefore, regular cleaning and maintenance are necessary to ensure the optimal performance of your solar panels. Use proper techniques and equipment like a soft brush, sponge, and non-abrasive cleaning solutions.

Can I clean my solar panels myself?

Yes, it is possible to clean your solar panels yourself. Use a soft brush or sponge with mild detergent to gently clean the surface, avoiding abrasive materials or harsh chemicals. Regular cleaning helps maintain their efficiency and performance.

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Types of professional cleaning

Types of Professional Cleaning for Solar Panels

Safeguard the efficiency and longevity of your solar panels by opting for professional cleaning services. These experts employ different techniques to maintain your solar panels effectively. Manual cleaning involves using water and specialized equipment, such as soft brushes or squeegees.

Alternatively, some companies offer advanced automated cleaning systems featuring robotic arms or sprayers. Select a reputable and experienced cleaning service provider for optimal care and maintenance.

Regular professional cleaning, typically once or twice a year, can amplify the efficiency and lifespan of your solar panels.

Does your solar lease cover panel maintenance?

The coverage for panel maintenance in your solar lease will vary depending on the agreement. Some leases may include regular cleaning and maintenance services, but reviewing your specific lease or contacting the leasing company for clarification is crucial. If maintenance is not covered, you may need to hire a professional or handle the cleaning yourself.

How to clean solar panels

Getting Started: Tools and Supplies

Essential Cleaning Tools

Essential tools for cleaning solar panels include a soft brush, a squeegee, a bucket, and a hose with a spray nozzle.

Recommended Cleaning Solutions

Use a mild, non-abrasive cleaning solution. Specialized solar panel cleaning solutions are available, but mild dishwashing detergent mixed with water often works well.

Preparing Your Cleaning Solution

Mix the cleaning solution according to the instructions. A couple of tablespoons in a bucket of water should suffice for dishwashing detergent.

The Cleaning Process

Dry Cleaning

When and Why to Opt for Dry Cleaning

Dry cleaning is best for light dust or dirt. It’s quicker and involves less setup.

Step-by-Step Dry Cleaning Procedure

  • Use a soft brush to sweep the dirt off the panels gently.
  • Be careful not to apply too much pressure.

Wet Cleaning

When and Why to Opt for Wet Cleaning

Wet cleaning is more effective when panels are very dirty or have sticky substances like sap or bird droppings.

Step-by-Step Wet Cleaning Procedure

  • Rinse the panels with a hose.
  • Gently scrub them with a soft brush dipped in the cleaning solution.
  • Rinse off the soap with the hose.
  • Use a squeegee to remove the water.

Advanced Cleaning Techniques

Dealing with Tough Stains and Deposits

For tough stains like tree sap, you may need to pre-soak the area with a cleaning solution before scrubbing gently.

Cleaning Techniques for Specialized Panels

If you have specialized panels, consult the manufacturer’s guidelines for cleaning recommendations.

Professional Cleaning Services: When to Hire and What to Expect

A professional cleaning service is worth considering if your panels are hard to reach, heavily stained, or require specialized cleaning.

Maintaining Clean Solar Panels

Regular Maintenance Schedule

Establishing a maintenance schedule is essential. Depending on your location and environment, this might range from monthly to twice a year.

Monitoring Solar Panel Efficiency

Keep track of your solar panels’ efficiency over time. A significant drop in performance might indicate that they need cleaning.

Tips for Minimizing Dirt Accumulation

Trimming nearby trees and installing bird deterrents can help minimize dust accumulation on the panels.

Frequently Asked Questions (FAQs)

How often should I clean my solar panels?

This depends on your location and environment. In dustier areas, more frequent cleaning might be necessary.

Can I use regular dish soap to clean my solar panels?

A mild dish soap mixed with water can be an effective cleaning solution.

Is it safe to clean solar panels in the rain?

It is best to avoid cleaning during rain for safety reasons. However, light rain can help in loosening dirt before cleaning.

What should I do if my solar panels are too high to reach safely?

Hiring a professional cleaning service is safer if the solar panels are too high or in a difficult-to-reach area.

How much efficiency is lost if solar panels are not cleaned regularly?

Dirt and debris can cause a decrease in efficiency ranging from 5% to 25%, depending on the amount of accumulation.


The importance of clean solar panels cannot be overstated. Regular cleaning ensures optimum performance and longevity of your investment.



Last update on 2024-04-12 / Affiliate links / Images from Amazon Product Advertising API