Your solar panels are only as efficient as they are clean. Dust, pollen, bird droppings, and environmental film build up on panel surfaces over time, and can reduce how much power they produce. Rex's purified-water cleaning helps remove that buildup using manufacturer-safe methods, with no chemicals or abrasives that could damage panels or affect warranty coverage.
We serve solar homeowners across Pasadena, South Pasadena, Arcadia, and the San Gabriel Valley. Licensed, insured, and Rex-guaranteed.
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Licensed & $1M Insured
Family-Owned Since 2016
See the difference clean makes on homes like yours
Solar panels are a significant investment, and they need care that matches. We use methods specifically designed to clean effectively without risking damage or warranty issues.
We use deionized, purified water that leaves zero mineral deposits on your panels. Tap water leaves spots and film that reduce efficiency almost as much as the dirt it's replacing.
Pasadena's dry climate means dust accumulates quickly on flat surfaces. We remove dust, pollen, leaf debris, and environmental film that block sunlight from reaching your panel cells.
Buildup on your panels can reduce how much sunlight reaches your cells, which can limit how much power your system produces. Our cleaning clears away that buildup so your panels can perform as efficiently as your setup and conditions allow.
During cleaning, we check each panel for visible damage, loose wiring, and excessive shading from nearby vegetation. We report any concerns so you can address them promptly.
Simple, Honest Pricing
No hourly guessing games and no surprise add-ons. You approve a firm quote, pay the deposit, and that's the number on your invoice.
✓ Firm price confirmed before we start
✓ Small deposit locks in your appointment
✓ Licensed, insured, and locally owned
Solar panel cleaning starts at $247 when booked as a standalone service. Final pricing depends on the number of panels, roof access, panel condition, and scope of work; bundled pricing is available when combined with other services. Every project receives a personalized quote before work begins.
Hundreds of homeowners across Pasadena and the San Gabriel Valley trust Rex's crew with their exterior cleaning needs. Here's what they say after the work is done.
Every 6 to 12 months for most homes in the Pasadena area. Panels located under or near trees, on dusty streets, or in areas with heavy bird activity may benefit from more frequent cleaning. We can evaluate your specific situation and recommend a schedule that makes sense for your system and location.
We don't recommend it for several reasons. Tap water leaves mineral deposits that reduce efficiency, household cleaning tools can scratch the panel surface, and working on a roof without safety training creates real injury risk. Professional cleaning uses purified water and proper equipment designed specifically for solar panels.
Energy loss from dirty panels varies a lot depending on your local climate, how long buildup has been accumulating, and the type of grime involved — homes in dustier or drier areas, or without a cleaning in over a year, tend to see a bigger difference. In some cases, localized hot spots from bird droppings can reduce individual panel output even further. Regular cleaning removes that buildup and helps your system perform as efficiently as your setup and conditions allow.
Our purified-water method is designed to avoid the residue, abrasives, and high pressure that can put warranty coverage at risk. Some solar panel manufacturers do include cleaning guidance in their warranty terms, so we use only the methods and tools generally recommended by manufacturers. If you have questions about your specific warranty, we're happy to review it with you before we start.
Solar panel cleaning starts at $247 for qualifying systems. Final pricing depends on panel count, roof pitch and accessibility, and buildup level such as bird droppings, fire-season ash, or hard-water deposits. Rexterior uses purified-water technology so panels dry spot-free, and every Pasadena solar system receives a personalized quote before work begins.
Tell us a bit about your home and we'll send back a free, no-obligation estimate — usually within one business day.