Always use non abrasive cleansers on your solar panels. An abrasive cleaner can scratch the surface of the panel and cause permanent damage and affect how well the solar panel works. There are commercial cleaning solutions to use or you can use a pool skimmer with a very soft cloth on it.
Check into all of your potential rebates. You know there are rebates, correct? The government (in certain states) has a bunch of ways that they'll reward you for taking the solar energy plunge. And there are also benefits during tax season. Look into them all so you'll get every penny coming back to you.
Overview of Apricus evacuated tube solar collector assembly and installation process.
Have financial background checks done on solar panel companies you plan to purchase from. You'll want use a company that will still be in business 20 years down the road. In this way, you can be certain your warranty will be honored and you will be able to get parts and maintenance as needed.