Module Cleaning
Cleaning your modules will increase your performance. It is not a requirement.
RAIN: Typically the rain takes care of this for you. Hosing your modules off after dust storm can contribute an extra 1-2% to your annual output.
SNOW: Typically the snow will come off of your modules without any intervention. Modules are dark and absorb light, even through snow, and warm up. Typically modules are installed with a 30 degree tilt. The tilt combined with the slick surface of the modules combined with the heat will allow the snow to slide off.  If you take the snow off yourself, or have someone else do it, please use great care to not scratch or harm the modules.
ICE: If you have ice on your modules, it is best to allow the ice to melt by the sun. We do not advise chiseling or hammering on the ice as it might harm the modules, possibly damaging the units and voiding the warrantee.

Tracker Maintenance
If you have a pole mounted Array Technologies tracker we recommend greasing your tracker twice a year.