What kind of maintenance do solar panels require?
Generally, solar panels require little to no cleaning on your part. Nature provides its own cleaning solution via rain, so proactive panel cleaning isn't crucial.
However, if you live in an area that is particularly smoggy or dusty, you'll want to hose off your panels a few times per year or hire a professional to clean them. If you lease your panels, choose a company that will routinely service your panels as part of the agreement.
You don't need to brush snow off your panels either, as snow will quickly melt or fall off of panels that are mounted at an angle higher than 15 degrees. Keep trees trimmed to avoid obstructing sunlight from reaching the panels.
If you observe excessive debris or damage on your panels, contact your solar installer to have them serviced per your performance or manufacturer's warranties, where applicable.