Is it actually worth cleaning solar panels?
Yes — especially in the Bay Area. Studies by the National Renewable Energy Laboratory (NREL) and several university labs show that soiled panels lose 5-25% of output over a year of accumulation in dusty or pollen-heavy environments. After a first ClearSweep cleaning, most residential customers see measurable recovery in their inverter or monitoring app output, and stay closer to rated output year-round with scheduled maintenance.
How often should I have my solar panels cleaned?
Most Bay Area homes do well with one cleaning per year. Homes near heavy tree cover, near construction, or with sprinklers that overspray the array benefit from twice-yearly cleaning. If your inverter shows a notable dip in production that does not match a weather pattern, a cleaning often brings output back in line.
Can hard-water spots actually damage my panels?
Mineral deposits from sprinkler overspray etch anti-reflective coatings over time. The coating is what makes modern panels efficient — once it is scratched or etched, output loss is permanent. This is one of the most common reasons a relatively young array underperforms. Annual deionized-water cleaning prevents this entirely and is far cheaper than panel replacement.
Will cleaning void my panel warranty?
No — provided we use the right technique. Most manufacturer warranties explicitly cover cleaning as long as it is done with appropriate (non-abrasive, non-pressurized) tools and water quality. ClearSweep uses soft-bristle brushes and deionized water, which is the manufacturer-recommended approach. We will review your installer documentation before the first clean and adjust if your specific brand requires a different tool set.
How does the weather and time of day affect scheduling?
We schedule around two factors: ambient temperature (cleanings on hot, dry afternoons leave water spots before panels rinse clean) and the array needs to be relatively cool for safe handling. Most jobs are booked for early morning — typically 8am-11am windows during summer, and broader mid-day windows during winter overcast. We will work with you to find a slot that minimizes impact on inverter production.
Do you use high pressure or soft brushes on panels?
Soft brushes only. High-pressure water can damage panel seals, frame mounting, and the anti-reflective coating on the glass. The right tool for installed solar panels is a soft-bristle brush attached to a water-fed extension pole — which is exactly what our crews use. The output difference between high-pressure and soft-brush cleaning on solar is zero; the safety difference for your warranty is significant.
