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, reducing energy production by up to 25%. That's money sitting on your roof every month. Rex's purified-water cleaning restores panel output without chemicals, abrasives, or anything that could void your warranty.
We serve solar homeowners across Pasadena, South Pasadena, Arcadia, and the San Gabriel Valley. Licensed, insured, and Rex-guaranteed.
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.
Bird droppings and tree sap create hot spots on panels that reduce output in the affected cells and can cause long-term damage. We target these deposits with gentle, panel-safe methods.
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.
Solar panels are designed to absorb sunlight, but any layer of buildup between the sun and the cells reduces absorption. Even a thin film of dust can drop your system's output noticeably. Regular cleaning keeps panels performing at the level you paid for.
Studies show dirty panels can lose 15% to 25% of their energy production. A single cleaning can recover hundreds of dollars in annual energy savings depending on your system size.
A residential solar system costs tens of thousands of dollars. Regular cleaning ensures you're getting the full return on that investment year after year, not leaving money on your roof.
Many solar panel manufacturers require regular cleaning as part of their warranty terms. Rex's purified-water method meets those requirements without any risk of voiding your coverage.
We treat your solar investment with the same care we bring to every job, using methods designed specifically for photovoltaic surfaces.
Call (626) 545-3132 to get started. Tell us about your solar setup: roof type, number of panels, and any buildup you've noticed. Our friendly Rex Crew will send you a clear, no-pressure quote faster than a dino charge!
Happy with your quote? Great! Choose a date that fits your schedule using our simple booking calendar. We'll lock it in and get everything ready for your Rex-level clean.
Sit back and relax while the Rex Crew removes dirt, dust, and debris that block your panels' efficiency. Enjoy cleaner panels, improved energy output, and a brighter return on your investment, no effort required!
See the difference clean makes on homes like yours
Hundreds of homeowners across Pasadena and the San Gabriel Valley trust Rex's crew with their windows, gutters, and everything in between. Here's what they say after the work is done.
Paz did an amazing job at cleaning our windows. They were friendly, fast and very efficient!
Andy and Atile were amazing! They are so friendly, professional, communicative and thorough. Very reasonable pricing. The windows look incredible! Check out the before and after photos. Highly, highly recommend Paz!
Thank you Andy for taking care of our 100+ year old windows and giving us a beautiful view to the outdoors! You are a delight to work with and we will call on you again!
Paz was cleaning my neighbor's solar panels and windows and were doing a great job. They were kind enough to fit me in on the same day and washed my windows inside and out. Everything is sparkly for the holidays!
We hired Paz Window Cleaning to clean our windows, outside and in, and screens. We learned that they offer other services as well, such as power washing. They did an excellent job and were a pleasure to work with. Professional and personable. We can see clearly now! Support a local business.
Great job! Great price! Great people! The windows are stunning. Andy is genuine and sweet and makes it easy. Locking him in for all windows, gutters and power washing.
I found Andy Paz Window Cleaning via Google search. The reviews looked good and I had to go with Andy as we have the same name. Andy went above and beyond to clean my dirty windows for the first time in 40 years.
Andy and Atile were both very professional and friendly while they did their work. We appreciated the care they took to not only do a good job, but to make sure we were satisfied. Thumbs up!
Paz Window Cleaning did an amazing job with a house wash on our 100 year old home! They made sure it would be gentle enough for the paint and original wood and the windows have never looked better.
My windows and patio doors are sparkling clean, thanks to Andy and Ashley's excellent work. It was a pleasure to have them here, and I will definitely call on them again.
This couple was very professional, and kind. From the first meeting for the estimate through the moment they finished, it was easy and pleasant. They didn't just do an amazing job on the windows and gutters, they were amazing with my large Great Danes too.
Andy was of great assistant. The business responded promptly and the job was completed effectively. Clear photos were offered and communication was easy! Definitely recommend!
I've had window cleaning services from several companies, but I'm so happy with PAZ's nearly flawless cleanliness. If you hire this company, you won't regret it. I'm confident you'll get the best window cleaning service.
Andy did great work on both our solar panel and gutters. Meticulous and friendly. It's good to have a very trustworthy business helping maintain my home, and I will be using his services every six months.
Andy and his wife are awesome at their job. They are not only nice, they are proactive, good at communicating, really focus and took time to make sure they get the cleaning done right. I had a house wash, pressure cleaned my patios and front, and window cleaning with them. All went very well.
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.
Research shows dirty panels can lose 15% to 25% or more of their energy output depending on the type and extent of buildup. In some cases, localized hot spots from bird droppings can reduce individual panel output even further. Regular cleaning restores this lost production and keeps your system running at the efficiency you're paying for.
Our purified-water method does not void warranties. In fact, many solar panel manufacturers require regular professional cleaning as a condition of maintaining warranty coverage. We use only the methods and tools recommended by manufacturers. If you have questions about your specific warranty, we're happy to review the requirements before we start.
Solar panel cleaning is priced per panel, with a $299 starting price — your final cost is whichever is higher. Final pricing depends on panel count, roof pitch and accessibility, and buildup level (bird droppings, fire-season ash, or hard-water deposits typically add to the job). Rexterior uses purified-water technology so panels dry spot-free, and every cleaning includes a free written inspection report flagging cracked panels, loose mounts, or seal damage. Every Pasadena solar system gets a custom quote — the price we send is the price you pay, with no surprise charges on the invoice.
Every day with dirty panels is energy and money lost. Schedule a professional cleaning and get your solar system back to full production. Rex uses purified water, warranty-safe methods, and our work is fully guaranteed.
