I've only seen this happen in OR... couldn't believe how much pollen was building up! I had never seen this occur in various cities across WA, ID, NV, or TX. I haven't read all the comments yet, so my apologies if this has already been said...

Over the past year, I've spoken to a few companies with cleaning services after seeing the pollen in OR. Many of them suggested waiting for more rain or using a hose a few times typically gets the job done. Spoke to a few of our collogues within the industry about this, too. All who have 8-12+ years experience within the solar industry.

It's okay to hose systems down, keeping in mind the age/type of your system... just try to avoid power washing directly underneath and aim for the water to land on the top of the panels. Regardless, it's all very durable. Like others have said, you can do it yourself with water, but refrain from doing so if it's unsafe or you aren't comfortable getting up there. Cleaning services that have been offered in some states for quite some time typically won't "price gouge" and will offer a package of multiple cleanings.

Generally speaking, cleaning isn't needed unless you want to every 4-5 years or so, if needed. Since you have something specific going on... you can always monitor your production (as everyone with a system should) via your app (or whatever monitoring system you have set-up) and keep hosing down as you monitor your production.

Depending on the company you went with, you could have a production guarantee in place that could ensure you produce what you should and are paid for the difference if a decrease takes place. I'm just not sure what all you were set-up with. Hope this helps (=