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Skylight Cleaning Service

Let the Light In: Skylight Cleaning Service in San Mateo County, CA

Skylights are the best way to bring natural light into a dark hallway or a cozy living room. But when they’re coated with grime, hard water spots, or that fine film of ash from the last North Bay fire, they don’t just look bad—they stop doing their job. You might as well have a ceiling.

We’re Fox Window & Gutter Cleaning, and we’ve spent nearly two decades cleaning skylights all over San Mateo County. Whether you’re in Millbrae, Burlingame, or down in San Bruno, we get your skylights crystal clear so you can actually enjoy the daylight instead of staring at a dusty pane.

Why Dirty Skylights Are a Bigger Deal Than You Think

Here’s the thing about skylights—they’re out of sight, so they’re out of mind. But that coastal fog in Millbrae? It doesn’t care. It rolls in off the Pacific, leaving moisture that mixes with the mineral-rich tap water and dries into a chalky white film. Add in some sticky pine sap from those mature eucalyptus trees, and you’ve got a mess that’s nearly impossible to remove with a hose and a squeegee from the ground.

The truth is, a dirty skylight can actually reduce the amount of natural light entering your home by a surprising amount. You’ll end up flipping on lights in the middle of the day, which just adds to your energy bill. And if you have an older skylight with original seals, that built-up grime can accelerate wear on the gaskets, which is the last thing you need during our rainy season from November through April.

Book Skylight Cleaning in San Mateo County

Our skylight cleaning service helps you:

  • Flood your space with genuine, unobstructed daylight
  • Remove hard water spots and mineral buildup from Santa Clara Valley Basin water
  • Clear away wildfire ash and soot from the 2020s North Bay fires
  • Prevent sticky pine sap and tree debris from etching into the glass
  • Spot potential seal or flashing issues before they become leaks

Our Skylight Cleaning Process in San Mateo County

We don’t just climb up there with a spray bottle. Each skylight gets a careful approach. Because most homes in Millbrae were built in the 1950s through the ’70s, we often deal with older units on sloped roofs in neighborhoods like Taylor Estates. We’ll use proper ladder stabilization techniques to get up safely, then assess the condition of the glass and frame.

We start by removing loose debris—leaves, twigs, and that fine dust from SFO traffic. Then we apply an acid-based cleaning solution specifically formulated to break down the hard water residue left by Millbrae’s groundwater. We rinse thoroughly, paying attention not to let wastewater pool on driveways or patios, especially in the Green Hills area where the old sewer mains are prone to slow drainage. When we’re done, we do a final polish on the interior pane and inspect the surrounding flashing and seals to make sure everything’s still watertight, so you’re not surprised by a leak in January.

We Clean Every Type of Skylight:

  • Fixed and vented skylights on sloped roofs
  • Tubular skylights and solar tubes
  • Modern flat-glass roof windows on newer builds
  • Older aluminum-frame units that need careful handling
  • Hard-to-reach skylights above stairwells or vaulted ceilings
  • Homes with post-construction dust or fresh move-in grime on skylights

Skylight Cleaning for Commercial Buildings

A clean skylight in your San Mateo County commercial space does more than let in light—it sets the tone for everyone who walks through your door. Whether it’s a retail shop on Broadway in Millbrae or a medical office near the 101, we get that your time is money. That’s why we schedule our skylight cleaning work around your operating hours, so your customers and staff never have to dodge ladders or deal with disruption. We’re fully insured, too, which means peace of mind for you and your property.

Our commercial skylight cleaning service is a great fit for:

  • Retail storefronts with skylights over display areas
  • Office buildings with atrium or conference room skylights
  • Restaurants and cafes using natural light to boost ambiance
  • Medical clinics and professional offices with waiting room skylights
  • HOA clubhouses and apartment complexes with common-area skylights

Our Skylight Cleaning Process

Cleaning a skylight isn't the same as doing a regular window. It's got its own quirks—angles, seals, and safety concerns. Here's how we handle it, step by step:

1. Assessment

We start by inspecting your skylight from both inside and out. On sloped roofs—like those in the Taylor Estates neighborhood of Millbrae—we check the pitch and condition of the flashing. We also look for hard water spots, which are common here due to the mineral-rich groundwater from the Santa Clara Valley Basin, and note any seal failures that could lead to leaks.

2. Prep & Protection

If we're working on a skylight over a two-story foyer or a stairwell, we'll lay down drop cloths to protect your floors. For exterior access on steep roofs, we use proper ladder stabilization techniques and safety equipment. We're careful about runoff too—older sewer mains in the Green Hills area can't handle a flood of water, so we manage our rinsing to keep wastewater out of your driveway and storm drains.

3. Screen & Track Cleaning

If your skylight has an operable model with a screen, we take it down and clean it with a soft brush to remove the fine ash that drifts in from wildfire season. We also wipe down the tracks and sills—a detail most folks don't even think about until they try to open a stuck skylight in the fall.

4. Glass Cleaning (Interior & Exterior)

For the glass itself, we use eco-friendly, ammonia-free solutions that break down the chalky white residue from hard water without harming the seal. On the exterior, we tackle the sticky sap from the eucalyptus and pine trees so common in Millbrae backyards. Our professional-grade squeegees and applicators ensure a spotless finish, even on angled glass.

5. Final Inspection

Before we wrap up, we inspect every skylight and window with you, making sure the results are exactly what you expected—or better. That's our promise.

Types of Skylights We Clean

Whether you’ve got one skylight over the stairwell or a whole row in a sunroom, we’ll get them clean—safely and without any guesswork. We’ve worked on all kinds of skylight styles and configurations in San Mateo County, including:

We Clean:

  • Fixed skylights (flat or domed)
  • Vented or operable skylights
  • Tubular skylights (sun tunnels)
  • Custom architectural glass skylights
  • Skylights with internal blinds or shades
  • Old aluminum-frame skylights (we handle them gently)
  • Clerestory windows and transom units

What's Included in Every Skylight Cleaning Appointment?

We leave your skylights and windows sparkling, bright, and professionally finished—every time. When you book with Fox Window & Gutter Cleaning, every skylight cleaning appointment includes:

  • Inspection of skylight seals, flashing, and glass condition
  • Interior and exterior skylight glass cleaning
  • Track, frame, and sill wipe-down (inside and out)
  • Screen removal, wash, and reinstallation (if accessible)
  • Streak-free finish—no hard water spots left behind
  • Friendly, honest service and a satisfaction guarantee

How Often Should You Clean Your Skylights?

Let’s be honest—remembering when you last cleaned your skylights is tough. And in Millbrae, it’s easy to forget until you’re staring up at a dull, streaky pane that’s blocking the afternoon sun. That’s why we offer recurring plans that take the guesswork out of it. You pick the schedule, we handle the reminders, and you get a small discount for your trouble. Here’s what we generally suggest for homes across San Mateo County, CA—and it depends a lot on your specific setup:

  • Every 3–6 months if you live near the coast or under heavy tree cover. That marine layer in San Mateo County is relentless, and it leaves a film that dulls the glass fast
  • Quarterly for businesses or storefronts where a clean, bright appearance matters to customers every single day
  • Twice a year for standard home maintenance—though honestly, with Millbrae's hard water and salty air, we've seen plenty of homes that need more attention
  • Before special events, home listings, or seasonal transitions. If you're putting your house on the market in Hillsborough, don't let a grimy skylight be the first thing buyers notice
Book Your Skylight Cleaning in San Mateo County, CA
Belmont, CABurlingame, CADaly City, CAHalf Moon Bay, CAMenlo Park, CAMillbrae, CAMountain View, CAPacifica, CAPalo Alto, CARedwood City, CASan Bruno, CASan Carlos, CASan Francisco, CASan Jose, CASan Mateo, CASanta Clara, CASouth San Francisco, CASunnyvale, CA

Service Areas We Cover