You paid a lot for that system. Dirty glass is quietly throwing away the production you're paying for.
If you've got solar in Central Texas, here's something most installers never mention: those panels get dirty, and dirty panels make less power. At River Blue Services, we clean glass all over Austin, Leander, Cedar Park, Round Rock, Georgetown, and the lake communities out toward Marble Falls and Horseshoe Bay—and increasingly, that glass is on the roof.
Here's the honest version of when solar cleaning is worth it, how we do it safely, and why you should never let anyone pressure wash your roof.
A solar panel needs visible light to do its job. It's the same thing our window-cleaning customers tell us all the time—how much brighter the whole house feels once the glass is actually clean. With solar, the stakes are higher, because that light is what you're converting into electricity.
And panels have a problem windows don't: they're mounted nearly flat. A vertical window sheds some of its own dust and rain runs off it. Panels lie back toward the sky, so whatever lands on them—pollen, dust, grit—settles and stays there indefinitely. It doesn't blow off. It builds.
The main thing that ever robs a panel of output is exactly that: layers of dust and grime from pollen and construction dust, sitting on the glass between the sun and your meter.
Central Texas throws a lot at a rooftop. Austin is in a constant state of construction, and the northern areas—all those new subdivisions going in—put a huge amount of dust into the air that settles right onto nearby roofs and panels.
Add our heavy cedar and oak pollen seasons on top of that construction dust, and panels can build up a real film over the course of a year. That's why it's a good idea to get your panels cleaned right along with your windows—same visit, same crew, one less thing to think about.
Gentle, water-fed, and built around not damaging your system or your roof
We clean panels with our water-fed pole system and soft boar's hair brushes that are constantly flowing with water. The bristles agitate the dust and grime loose while the water rinses it away.
Unlike your windows, panels don't need to be dried or squeegeed. We don't need de-ionized water either—the goal here is simply removing the dust and pollen that block the light. We may or may not get on the roof depending on pitch and how far up the panels are.
The boar's hair bristles are gentle enough that they won't harm the panel glass or coating. It's the opposite of an aggressive, scratch-the-surface approach—just enough agitation to lift the grime and float it off.
This is the one we feel strongly about. Pressure washing and roof work almost never belong in the same sentence. A pressure washer can crack or damage the panels outright—and it can absolutely tear up an asphalt shingle roof, blasting away the granules that protect it. Other roof types may not be as fragile, but it's simply not worth the risk.
This is the difference between hiring a window-cleaning company that understands roofs and glass, versus a general pressure-washing outfit that treats every surface like a driveway. Your panels—and your roof—need a soft touch, not 3,000 PSI.
We won't pretend you can't clean your own panels—but here's our honest concern. It comes down to three things that don't mix well: tall ladders, water, and glass.
You could fall. You could slip. And if something goes wrong up there and a panel gets struck, you can damage the glass or the wiring behind it—turning a cleaning into an expensive repair. A water-fed pole lets us clean a lot of panels safely from the ground, which is exactly why we use it.
One note on our limits: we generally don't clean second-story panels. Interestingly, some steeper roofs are actually easier to reach from the ground with a pole and brush—so don't assume a steep roof is a no. We'll tell you honestly what we can safely reach.
For most Central Texas homes, once a year does the job. The easiest approach is to bundle it with your regular window cleaning so the dust, pollen, and construction grime get cleared off your panels and your glass in the same visit. If you're near new construction or under heavy oak and cedar, that annual reset is what keeps your system producing what you actually paid for.
Same Texas water and dust that spots your panels also haze your windows.
How to Remove Hard Water Stains from Windows in AustinSolar panel cleaning starts at $250 and can be bundled right in with your window cleaning. Just head to the quote page and add Solar Panel Cleaning to the form—we'll take it from there.
