If you know that you cannot reach your solar panels to clean them, the best thing to do would be to hire a professional to clean it for you. if you are not sure of who to call, you should ask the company that came and installed the panels for you.
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A solar powered fan for your attic is a good choice if switching completely to solar power is not feasible. The fan will have a temperature sensitive gauge and switch itself on when necessary. This will remove heat and lower the cost of cooling. It's also solar powered, so you don't have to pay to power it.
One of the greatest benefits of solar energy is the fact that it will never run out. Short of the sun burning out, it will always be there to provide us power. Using solar energy is unlike any other energy source because it is a consistent power source and will be there until the end of days.