The most common materials that block sunlight are dust, leaves and water.
Solar panels should be cleaned at least once every year, so that they retain their optimum productivity and effectiveness.
However, based on where you live and the level of dirt and pollution where you live, you may need to clean your panels more often.
Homeowners may opt to clean the solar panels themselves, or hire a trained professional to carry out the work.
Those who choose to DIY should use a soft brush and detergent to remove dust.
Check out our in-depth guide to optimising your solar panels’ efficiency.