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To create clean energy, solar panels are a dependable option. However, it is essential to keep their efficiency top-tier, otherwise, accumulating dust, dirt, and debris can diminish their performance significantly over time. This blog post will discuss why, when, how, and how often to clean solar panels.

solar panel

Dirty vs. Clean Solar Panels: What are the differences?

When solar panels become encrusted with grime such as dirt, dust, debris, and bird droppings - they are said to be 'dirty' - diminishing the amount of sun rays absorbed and consequently reducing their efficiency. Conversely, clean solar panels are obstruction-free and can efficiently collect the sun's rays to generate electricity.

Dirty solar panels can hinder your energy-producing ambitions: their efficiency is reduced by up to 25%, producing significantly less power than clean ones. With spotless, pristine solar cells, you'll get the most out of your array as they operate at maximum capacity and generate more electricity.

Does rain clean solar panels?

Rain can certainly assist in cleaning solar panels, yet it may not be sufficient to keep them fully clean. The water droplets from rain might get rid of some filth and dirt; however, they could also leave behind streaks, mineral deposits, or other residue that impairs the effectiveness of your panels. In certain situations, precipitation may even worsen the condition of solar panels by distributing dust and debris around their surface.

solar panel

When is the right time to clean solar panels?

Clean solar panels twice a year, before the summer and winter seasons, to keep your solar panels operating optimally. Nevertheless, if you live in a region with high dust or air pollution levels, more frequent cleaning may be necessary to keep your energy production steady. 

How do you know the solar panels require cleaning?

Regular inspection is key to ensuring your solar panels are in optimal condition. If you observe any dirt or debris on the panel's surface, it may be time for a cleaning! Moreover, if there's been a drop-off in energy production from your system recently - this could indicate an accumulation of dust and detritus requiring cleaning. With careful monitoring and attention to detail, you can maximize the efficiency of your power resources.

Cleaning solar panels in direct sunlight can cause streaks due to the quick evaporation of the cleaning solution left behind.

In what weather?

It is best to clean them on a cloudy day or when the sun's rays are not too strong - such as in the early morning or late afternoon to ensure optimal performance and clarity of your solar panels.

How often do you need to clean solar panels?

Depending on the dust, dirt, and debris in your local environment, you may need to clean your solar panels more or less frequently. The most common recommendation is bi-annual cleaning; however, if you live in a region with higher levels of air pollution or other contaminants, increased maintenance may be necessary for optimal efficiency.

How to clean solar panels?

It's necessary to keep your solar panels clean to ensure they perform at their peak and last as long as possible. Here is the simple process you can use to do so:

Step 1: Tools/Materials preparation

You'll need the right tools and products to gleam your solar panels. Here's a checklist of what to gather:

  • A bucket of warm water
  • A soft-bristled brush or sponge
  • A squeegee or soft towel
  • A cleaning solution specifically designed for solar panels (or a mixture of water and mild soap)

Step 2: Turn off the system

Before cleaning your solar panels, switch off the system- it is vital if you are linked to a network. Doing this will protect you from any risk of electric shock.

Step 3: Start cleaning

To clean your solar panels, follow these steps:

  • Fill the bucket with warm water and add the cleaning solution. Refrain from using toxic chemicals that can harm the panels or our planet.
  • Wet the brush or sponge with the cleaning solution and gently scrub the panels in a circular motion-guard against utilizing too much force or abrasive items that could scratch the surface of the panels.
  • Rinse the panels with clean water to remove any soap residue. To complete this step, you can either opt for a hose filled with clean water or use a bucket.
  • Use a squeegee or soft towel to dry the panels. For a streak-free, spotless finish, begin from the top and slowly reach the bottom.

Avoid doing so during midday or in direct sunlight to ensure streak-free, residue-free results when cleaning solar panels. You should opt for early morning or late afternoon instead; this will allow the cleaning solution plenty of time to do its job without drying out too quickly and compromising your panel's effectiveness.

How much does it cost to clean solar panels?

The cost of cleaning solar panels can vary depending on your chosen method. Here are the estimated costs for different cleaning options:

1. Solar panel cleaning services

Investing in a solar panel cleaning service can range anywhere from $100 to $300 or higher, depending on the scale of your system, its geographical location, and how often cleans are needed. Additionally, extra costs may be incurred if tough stains have to be removed - such as bird excrement!

2. Automated solar panel cleaners

Automated solar panel cleaners, such as robots or drones, enable you to clean your panels without manual labor. The price tag for these systems can range from $1,000 to a hefty sum of around $10,000 - the cost depends on the model and features. Installation costs and maintenance fees also need to be taken into account when looking at budgeting over time.

3. DIY

To save money, consider cleaning your solar panels yourself. The cost of supplies is lower than hiring someone else - although you must follow all manufacturer recommendations and safety guidelines when performing maintenance work on such systems! Utilize a soft-bristled brush or sponge, and use mild soap and warm water to avoid damaging the equipment.

Regarding solar panel cleaning, various approaches come with expenses ranging from high-end professional services to automation technology or Do It Yourself (DIY) methods. While the initial cost can be hefty for automated systems and hiring pros, DIY is the most budget-friendly approach if you're willing to invest your time and energy; however, personal safety should always remain a top priority during such tasks.

Solar Panel Cleaning Tips & Notices

Here are some additional solar panel cleaning tips and notices:

1. Use Water at a Similar Temperature

Utilizing water at a temperature similar to solar panels is suggested to prevent thermal shock or harm. If hot solar panels are exposed to cold water, they may contract rapidly and be susceptible to cracking or destruction. Therefore, it's ideal to wait until the panels have cooled off naturally before cleaning them - this will ensure maximum effectiveness and protect against any potential damage.

2. Do Not Use Water With High Mineral Content

Investing in distilled or deionized water for your solar panel cleaning needs is prudent if you live in an area with hard water. These types of water have been treated and possess the remarkable ability to eliminate minerals - ensuring no deposits are left on the panels afterward. Such precautionary steps ensure your solar panel's efficiency remains intact while its lifespan extends well!

3. Avoid Using an Abrasive Material

To protect the efficiency of your solar panels and ensure they don't get damaged while cleaning them, avoid abrasive materials - such as steel wool and harsh scrub brushes - at all costs. Instead, opt for a soft-bristled brush or sponge to remove any accumulated dirt on their surface. This practice will safeguard your solar panels' long-term productivity!

4. Do Not Walk Over the Modules

It helps if you never walk over your solar panels to prevent damage. Cleaning the panels from the ground with a cleaning tool or ladder is much safer and ensures they remain in proper working order. It also allows you to apply just enough pressure to avoid damaging them while still getting rid of all dirt and debris buildup.

To ensure that your solar panels remain efficient and long-lasting, it's critical to only use the right cleaning solutions, equipment, and techniques as your manufacturer recommends. Deviating from these recommendations can cause damage to the panels, leading you to risk voiding their warranty. Before attempting maintenance on your solar panel system, consult the manufacturer for specific instructions - this will help keep them in top condition!


To preserve the functioning and lifetime of your solar panels, you must keep them clean. Cleaning should be done regularly, at least twice a year or more, in locations with dust or contamination. Use soft brushes or squeegees combined with gentle cleaning agents and distilled/deionized water to wipe away dirt and particles without causing damage to the system - safety must always remain paramount!

Regularly following the manufacturer's guidelines for maintenance and upkeep will guarantee that you are using appropriate materials and techniques. Additionally, this could help keep your warranty intact. With these tips in mind, you can ensure that your solar panel system is functioning at its peak efficiency while saving money on energy costs in the long term.