You should always have a lease transfer option if you lease the solar energy system versus purchasing it outright. If your home is sold, you will need to have this option handy. If you can transfer it to the new owners, you'll be fine.
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Cleaning your solar panels does not need to be labor intensive. You want to avoid abrasive soaps at all costs, as they can deteriorate and even destroy your panels. So long as there is not caked up dust or bird droppings, frequent rinses with just hose water should be more than enough.
Consider changing out your windows when you install a solar energy system. Installing energy efficient windows will help your home be easier to heat and cool, maximizing your energy savings. Since you will now be providing your own power, it is a good idea to save energy wherever you can.