Quick answer
Yes — dirty solar panels lose output, and cleaning restores it. Dust, pollen, bird droppings and Calgary’s hard-water spotting can reduce production noticeably, especially after a dry, dusty stretch. We clean panels with the same pure-water, residue-free system we use on glass — no harsh chemicals, no scratching, no mineral spotting — to safely restore output. Most homeowners clean panels once or twice a year.
Do dirty panels really lose output?
Solar panels make power from sunlight, and anything blocking that light — a film of dust, pollen, soot, or bird droppings — cuts production. Light, even soiling trims output modestly; heavier or patchy soiling (bird droppings shading a cell, for example) hurts more. After Calgary’s dry, dusty summers and pollen-heavy springs, panels can build up enough grime to be worth cleaning.
The hard-water catch
Spraying panels with a hose seems easy — but Calgary’s hard water dries leaving mineral spots right on the glass surface, which can themselves block light and attract more dirt. That’s why rinsing with pure (deionized) water matters for panels just as much as windows: it leaves zero residue.
How panel cleaning is done safely
- Pure-water, soft-brush method — lifts soiling without abrasives or chemicals that can damage the panel coating.
- From the ground where possible — water-fed poles reach roof panels safely, avoiding foot traffic on the array.
- Residue-free rinse — so the surface dries clear and panels work at their best.
Avoid pressure washers (they can force water past seals) and abrasive pads or harsh cleaners.
What does it cost, and how often?
Panel cleaning is usually quoted by the number of panels and roof access. Many Calgary homeowners bundle it with their window cleaning to save a trip charge. Once or twice a year is typical — more if you’re near fields, gravel roads or heavy tree cover. See our solar panel cleaning service for details.
Restore your panels’ output
Already booking a window clean? Add your panels and we’ll do both in one visit. Get a free quote.
Frequently asked questions
Does cleaning solar panels increase output?
Yes. Dust, pollen, bird droppings and hard-water spotting block sunlight and reduce production; cleaning restores it. The effect is bigger after dry, dusty stretches or with patchy soiling like bird droppings.
How often should solar panels be cleaned in Calgary?
Once or twice a year for most homes — more if you’re near fields, gravel roads or heavy trees. Many homeowners bundle it with their window cleaning.
Can I just hose off my solar panels?
It’s risky in Calgary — hard tap water dries leaving mineral spots on the panel surface, and pressure can force water past seals. A pure-water, soft-brush clean is safer and residue-free.
