Know How to Clean Solar Panels for Optimum Performance

Once you get your solar panels installed, you will find them fairly maintenance-free. Many factors affect the energy your solar panels produce, so cleaning them is the easiest and best solution. Over time solar panels will get covered with pollution, dust, grime, and bird droppings. These obstructions block sunlight and will reduce power production. According to National Renewable Energy solar energy loss can range as high as 25% in some areas. When solar panels are not cleaned, an increase in power generation on the inverters is immediately seen.


It depends on where you live and the weather conditions. Solar panels installed in windy and dusty areas may require more frequent inspection and cleaning. Some areas need a weekly washing, while other areas can go every other month – review your solar manufacturer’s specifications.


Each solar panel is different, so make sure to review the instructions from the solar manufacturer first before cleaning the panels; some panels are sensitive to certain chemicals, and others may have fragile components that you need to be aware of.

Inspect the solar panels on a periodic basis. Before washing, make sure that there aren’t any cracks and ensure all connections are tight. If there are damaged wires or cracks, it might be time to call an electrical technician.

Remove any debris on the solar panel. Trim back trees or plants that may be blocking the sun’s energy to the solar panels.

Fill a bucket with warm water and with a cleaning solution. Green cleaning supplies do a great job on glass and solar panels. Here’s a simple non-toxic recipe for glass cleaner: 1/4 cup vinegar, 1/2 teaspoon liquid non-abrasive soap or detergent, and 2 cups of water in a spray bottle. In drier areas when there is water rationing – the solar panels can be cleaned fairly well using an air hose.

Use a non-abrasive cleaning sponge or towel to wash the glass. Get the glass as clean and clear as possible – don’t scratch it.

Remove the remaining water with a high-quality squeegee to avoid hard water mineral build-up.

Use a lint-free cloth to dry the edges of the panel.

Some companies will clean solar panels for you. If you choose to use a solar panel cleaning service be sure they are insured – in case there are any accidents.