You did the math when you bought your solar panels. Here’s some math the installer probably skipped: industry testing shows dirty panels can lose up to 20% of their energy output — the so-called 20% rule. In Cache Valley, where summer field dust, pollen, winter inversion grime, and the occasional wildfire-smoke season all settle onto glass, panels that haven’t been cleaned in a year are quietly underperforming every single sunny day.
Rain doesn’t fix it. Rain rinses loose dust, then dries and leaves mineral spots of its own — and it does nothing for the baked-on film that builds up through a dry Utah summer.
Why we clean with deionized water and soft brushes (and why that matters)
Solar glass is tough, but it’s still glass with an anti-reflective coating — and cleaning it wrong costs real money. Two common mistakes permanently hurt panels:
- Abrasive pads or stiff brushes micro-scratch the surface, scattering light away from the cells forever
- Hard tap water dries into mineral deposits — Cache Valley water is famously hard, so hosing panels down can leave them worse than before
Dr Squeegee’s uses the method panel manufacturers themselves recommend: deionized water (filtered until it contains virtually no minerals) applied with soft-bristle brushes on water-fed poles. The pure water dissolves and lifts the baked-on dust, the soft bristles agitate without scratching, and everything dries spot-free — no soap, no residue to attract the next layer of dust.
It’s the same pure-water technology behind our streak-free window cleaning — this is our home turf.
What solar panel cleaning costs in the Logan–Hyrum area
| Service | Price |
|---|---|
| Residential array cleaning | Starting at $150 |
| Typical regional range | $120–$300 |
A standard rooftop array takes 1–2 hours. Given a typical Cache Valley system produces hundreds of dollars of power each summer, recovering a double-digit efficiency loss usually pays for the cleaning within the season.
When and how often
- Late spring — clear winter inversion film and spring pollen before peak production months
- Once per year minimum; twice for homes near fields, gravel roads, or after a smoky summer
- Utah demand peaks July–September, when owners notice their production numbers dipping — the savvy move is cleaning in May or June, before peak sun
Frequently asked questions
How much should I pay to clean my solar panels? $120–$300 for a standard home array in our region; we start at $150.
What is the 20% rule for solar? Testing shows soiled panels can lose up to 20% of output without regular cleaning — the rule of thumb the industry uses to justify a cleaning schedule.
How should I prepare? Turn off your solar inverter before we arrive (we’ll remind you when we confirm the appointment). That’s the only prep needed.
Can’t I just do it myself? The failure modes are scratched coatings, hard-water spotting, and a homeowner on a steep roof. Professional pure-water equipment solves all three from a position of safety.
Get your output back
Dr Squeegee’s is a family-run, licensed and insured company based in Hyrum, serving Logan, Smithfield, Providence, Hyde Park, Wellsville, Paradise, and all of Cache Valley — in English and Spanish. Call or text (208) 650-5223 for a free quote, bundle it with window cleaning for 10% off the added service, and every job is backed by our 7-day satisfaction guarantee.