Please choose the correct ending to complete the given sentence: Home and Garden: [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.

Ending1: [title] Remember to have every aspect of each piece cleaned and polished before you start washing. [title] Keep automotive repair tools in a safe place for emergencies. Ending2: [title] Remove dirt, algae, and other gunk with water. [step] Thoroughly wash your panels (and their corresponding accessories). Ending3: [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. Ending4: It should also include : [substeps] Scouring powder small brush cleaner. Polyurethane mud remover and oil to remove rust.

Answer format: ending1/ending2/ending3/ending4