Nobody has measured a national average cost to clean solar panels. What circulates is an average of unlike jobs, and the published local range is the one you can check.
The average cost to clean solar panels
There is no reliable national average, because a cleaning quote is built from local inputs. Residential cleaning in the Bay Area runs $175 to $350 for systems of 10 to 40 panels, and most East Bay homes in the 20 to 30 panel range land between $225 and $275. Both figures come from the published price list rather than from a survey of cleaners around the country. Total Solar Cleaning quotes from that range, priced by panel count, roof access, and soiling level.
That range is wide on purpose. The low end is a small array on reachable roof space. The high end is a bigger array on a two-story roof with a steep pitch, where the setup costs as much time as the washing. The two jobs take different amounts of time on the roof, and the quote follows the time.
A per-panel rate has the same problem. A 20-panel job on a single-story roof and a 20-panel job on a steep two-story roof come out identical at $10 to $30 a panel. The setup on the second roof takes longer, and per-panel math has no line for it.
The five inputs that set a cleaning quote
Five inputs move a quote, and the panel count is only the first of them.
- Panel count. More glass means more time on the roof, and it sets the floor of the quote.
- Roof access. Story count, pitch, and where a ladder can safely sit. This one usually moves the number more than the panel count does.
- Mount type. A ground-mounted array skips the ladder and the fall protection, so panel count drives nearly its entire price.
- Soiling level. Light dust and pollen lift quickly. Bonded droppings, ash, or a mineral film from an older tap-water rinse take extra passes.
- Local labor. Rates differ by region, and this input is the one a national average is built from.
Access and soiling are the two a homeowner cannot judge from the ground, and they are the two that move a quote most. A real quote follows a look at the roof, which is why commercial work is priced custom.
Cost by system size
The published range breaks down by system size. Systems of 10 to 20 panels run $175 to $225. Systems of 21 to 30 panels run $225 to $295. Systems of 31 to 40 panels run $295 to $350, with anything larger quoted custom. Those brackets assume ordinary access and routine soiling. A steep two-story roof lands near the top of its bracket, and a ground-mounted array lands near the bottom of the same bracket, because access is the smaller part of a ground-mount job.
The first cleaning costs more than the visits after it
The first professional cleaning on a system with no cleaning history costs more than the visits that follow it. The panel count is the same on both visits. What changes is the glass: bonded pollen, droppings, ash, and a mineral film from an earlier tap-water rinse all take extra passes to lift without scratching the surface. Once a system is on a schedule, every visit starts from a cleaner baseline. Published plan pricing is 10 percent off for an annual plan and 15 percent off for a semi-annual one, with quarterly commercial work at about 20 percent off.
Where the per-panel rate breaks down
A per-panel rate cannot account for anything beyond the count, because the inputs that set the price are not in the math. Story count, pitch, and soiling level never appear in it, and neither does the fall protection a two-story roof requires. Routine cleaning is not a guaranteed energy payback. The widely cited UC San Diego study measured panels through a long dry stretch and found about 7 percent of output lost to accumulated dust, with a mid-summer wash on a 5 kW system recovering roughly $20 in electricity. For a roof carrying even, fine dust, that result holds.
The cases a cleaning is for are the concentrated ones: bird droppings that shade a whole cell, ash that bonds to warm glass, pollen film that rain will not lift. Those are the soiling types that damage glass and put warranty coverage at risk, and lifting them safely without abrasives, acids, or a pressure washer separates a cleaning from a hose-down. The U.S. Department of Energy overview of photovoltaic technology explains how anything sitting on the glass cuts the light reaching the cells.
Residential quotes and commercial quotes
Residential cleaning is quoted from a published range. Commercial work is quoted after someone has seen the roof, the array, and the access, because a walkable flat warehouse roof and a multi-story building that needs a lift are different jobs with different setups. The variables behind a commercial quote are in what drives commercial solar panel cleaning cost. Commercial accounts on a quarterly contract pay about 20 percent less per visit than one-off cleanings, with priority scheduling and a written report after each visit.
What this looks like in Concord, Danville, and Dublin
In Concord, where Total Solar Cleaning is based, residential quotes sit at the lower end of the published range because the logistics are straightforward. Danville's two-story homes and larger arrays sit at the higher end, the access difference a national average flattens. Dublin's newer installations run 35 to 40 panels, so panel count, not access, moves the quote.
A real quote starts with your panel count, how many stories the roof has, and what is visible on the glass. The Bay Area cost breakdown and the residential pricing guide carry the full detail. Total Solar Cleaning is ISCA certified and carries $2 million in liability coverage. Every visit uses deionized water and soft-bristle brushes, no abrasives and no pressure washing. Call (833) 444-4173 for a quote on your system, or request one online. Scheduling usually runs 3 to 7 business days out.