It's not just that you have to clean it. It is that if you don't you have a heater instead of an airconditioner. So if you have a rain followed by 110F you have

It's not just that you have to clean it. It is that if you don't you have a heater instead of an airconditioner. So if you have a rain followed by 110F you have a very bad day. And I can buy a lot of AC for $60 an hour that I would pay someone to get on my roof.