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Here's what we were working with on this Claremont home. The panels were coated in that dry, chalky film you get from months of dust and debris settling in. It's common in this area. The surface buildup was heavy enough that the panel glass had lost most of its reflective quality entirely.
We do biannual cleanings for a reason. Waiting too long means that grime gets harder to cut through and your system is underperforming for longer stretches. Two cleanings a year keeps things manageable and keeps your output where it should be. The difference between the before and after here is hard to miss - panels going from a dull, hazy surface to deep, clean glass that actually reflects the sky.
For Claremont homeowners with solar, regular cleaning is just part of protecting the investment you already made. Your panels are up there working every single day. A little maintenance goes a long way toward making sure they keep doing their job at full capacity.