New Local Resource Quantifies Production Losses From Santa Ana Dust, Freeway Particulate, and Pigeon Damage

Corona, United States – July 9, 2026 / Pressure Washing Marketing Pros /

Squeegee Guys has published a new local guide for Corona homeowners that breaks down what it actually costs to leave residential solar panels uncleaned in Inland Empire conditions. The city’s six-month dry season, Santa Ana wind events, and freeway-corridor particulate combine to push soiling losses past the California averages most homeowners reference. The new Corona solar panel cleaning resource walks through production-loss math, NEM 3.0 cost implications, and cleaning frequency by neighborhood.

What Corona Solar Owners Face Year-Round

Corona sits where the standard rain-rinses-the-panels assumption breaks down. The city receives roughly 9 to 14 inches of rain per year, almost all of it between November and April, leaving panels untouched through the entire summer dust season. According to National Renewable Energy Laboratory soiling research, Southwest U.S. sites sit at the high end of energy-weighted soiling losses, which range from 4.3 to 15.5 percent across U.S. installations. Local air quality compounds the problem. The American Lung Association ranked Riverside County among the nation’s worst for both ozone and particle pollution, and the I-15 and SR-91 corridors run directly through Corona. Combined with Santa Ana wind events and pigeon activity under tile roofs in neighborhoods like Eagle Glen and Sycamore Creek, those conditions make the standard California cleaning math wrong for Corona homes.

What the New Guide Actually Covers

The guide quantifies the cost of those conditions on the average Corona system. On a typical 8.85 kW residential array, moderate soiling, the kind that builds up after roughly a year without a wash, costs about $370 in lost production annually at current Southern California Edison residential rates. Heavy soiling pushes the figure past $1,100. The guide also walks through how the NEM 3.0 export rules that took effect in April 2023 widen the gap, since panels soiled during the 4 p.m. to 9 p.m. peak window force homeowners to import expensive grid power they would otherwise self-generate. Frequency recommendations vary by neighborhood, roof type, and freeway proximity.

What Squeegee Guys Says Corona Homeowners Should Know

Fabian Medranda, co-owner of Squeegee Guys, said the production gains after a thorough cleaning are what surprise most clients.

“Most clients see a 10 to 20 percent jump in production after we clean their panels, and on heavily neglected systems we’ve seen 30 to 40 percent. The math favors cleaning in Corona because we have a six-month stretch where rain doesn’t touch the panels, and that’s not what most California advice assumes,” said Fabian Medranda, Co-Owner, Squeegee Guys.

Where Corona Homeowners Can Learn More

Corona homeowners can read the full breakdown of soiling losses, NEM 3.0 implications, and cleaning frequency on the Squeegee Guys website, with additional company updates available on the Squeegee Guys Facebook page.

About Squeegee Guys

Squeegee Guys is an exterior cleaning company based in Corona, California. The company provides residential and commercial window cleaning, solar panel cleaning, roof cleaning, gutter cleaning, driveway cleaning, concrete cleaning, and Christmas light installation across the Inland Empire and parts of Orange County. Squeegee Guys carries $2 million in liability insurance.