[header] How to maintain a solar panel [title] Purchase a solar panels cleaning kit. [step] It should contain a liquid soap, a wiper, a small brush and in some cases another brush with a longer handle. In many ways, these items are similar to what you use to clean your car, so if you cannot purchase a cleaning kit that is specifically designed for cleaning solar panels then you can substitute it with your car cleaning equipment instead. 
[title] Mix the soap with water in a bucket. [step] The amount that needs to be mixed should be mentioned on the bottle of liquid soap.