What ever side of the fence you're sitting on, it makes sense to maximise your investment by maintaining your systems efficiency.
If you're not aware, most systems are set up to work at the maximum efficiency of the lowest performing panel (just like the council/government). So if one panel is dirty, and not working at optimum, then the whole system is not working maximum. (This is a post on cleaning not wiring, if you'd like to discuss more on installation and configuration, reach out and i can point you in the direction of literal wizards of the industry)
You should have your solar cleaned every year. It's a stipulation in most warranties too. A regular cleaning and maintenance plan insures you're not only making the most bang for buck off your solar investment, but also maintains those returns for years to come and keep your warranty intact for future peace of mind.
Sure the rain will knock off the loose dust off the panels, but if rain did such a good job of cleaning, then your car wouldn't need a clean after a rain shower . . . would we?
A regular pure water clean knocks all the bird droppings, dirt, dust and road grime from your panels leaving nothing but crystal clean panels operating at maximum $$$ returns.
Zen Window Cleaning use the latest technology in pure water cleaning to give you 5 star results, first time, every time. The water we use to clean with is so pure that if you were to drink it consistently, it would leach the calcium and minerals from your teeth. #science
eg: 25x Panels = $199
eg: 25x Panels = $249
The job isn't done until you're seeing the promised results. We believe so deeply in the quality of our work that if you're not happy with the results, you don't pay.