An annual clean and inspection should be done on your solar system to keep it preforming at optimum levels. But I would recommend visually checking the solar panels and any sign of debris or anything that will effect the performance. When cleaning the panels do not use any harsh chemicals, a soft bush and some water is all that is required. If you are not confident about accessing your roof or solar array the team at Streamline Solar can put you on our annual maintenance contract and get it sorted for you.