How do you clean attic windows?
Attic windows often sit tucked away where dust, cobwebs, and grime can accumulate unnoticed. Because they let in natural light high in your home, keeping them clean not only brightens the space but also extends the life of the window and seals. In this post, we’ll walk through everything you need to know to safely and effectively clean attic windows—whether they’re small gable windows, skylights, or dormer windows.
Why Clean Attic Windows?
Maximize Natural Light: Dust and debris on the glass greatly reduce sunlight entering your attic.
Prevent Damage: Dirt buildup can trap moisture against window seals or frames, encouraging rot, mold, or seal failure.
Improve Ventilation: Clean windows ensure proper airflow when opened, reducing musty smells and humidity.
Enhance Insulation Performance: A clear view lets you spot cracks, drafts, or seal gaps early—saving on energy bills.
Safety First
Because attic windows are often located on steep roofs or high walls, safety should be your top priority:
Use a Sturdy Ladder: Choose a ladder rated for your height and weight. Make sure it’s on a level surface—if you’re setting it on rafters or ceiling joists, place a piece of plywood underneath for stability.
Have a Spotter: Whenever possible, work with a partner who can hold the ladder and pass you tools.
Wear Proper Footwear: Non-slip shoes or boots will help you maintain traction on attic rafters or roof surfaces.
Mind Overhead Hazards: In a cramped attic, watch for exposed nails, low rafters, or electrical wiring. If you’re cleaning from inside and leaning a pole external to the roof, pay attention to rafters and insulation placement.
Consider Professional Help: If a window is high on a steep roof—especially a skylight—hiring a professional window-cleaning team (like ours at TLC) is safer and often more efficient.
What You’ll Need
Before you begin, gather the following tools and supplies:
Extension Pole with Window Squeegee Attachment: Look for a two-piece or telescoping pole so you can adjust length.
Soft-Bristle Brush or Microfiber Mitt: For scrubbing stubborn grime on glass and frames.
Bucket: Fill with warm water mixed with a mild, streak-free window-cleaning solution (or a few drops of dish soap).
Clean Water Rinse: A second bucket of plain water or a garden hose if working from outside.
Microfiber Cloths: For wiping frames, sills, and any remaining drips.
Drop Cloth or Towels: To protect attic floors from drips and runoff.
Protective Gloves and Safety Glasses: Especially if cleaning old, dusty windows that kick up debris.
Optional: Distilled Water: For a spot-free finish, especially if your tap water is hard.
Step-by-Step Cleaning Process
Prepare the Area
Lay down a drop cloth or old towels over the attic floor beneath the window to catch drips.
Remove any items (boxes, storage bins, insulation) that obstruct your workspace.
Dust and Debris Removal
Using a dry microfiber cloth or a soft-bristle brush, gently sweep away loose dust, cobwebs, and insect debris from the glass and the mullions (the wood or metal dividers).
If you have a small handheld vacuum with a soft brush attachment, that works, too—just be careful around the glass and wiring.
Apply Cleaning Solution
Dip your soft-bristle brush or microfiber mitt into your bucket of warm, soapy water.
From either inside (if the window is interior-facing) or outside (if you can safely access the roof), scrub the glass gently in a circular motion. Start at the top pane and work downward to avoid drips on already-cleaned areas.
For skylights: tilt the extension pole squeegee to match the pitch of the roof (usually 10–45 degrees) and apply cleaner the same way.
Rinse Thoroughly
If you’re inside and the window swings open, use a garden hose from the roof side (on a low-pressure setting) to rinse, taking care that water doesn’t pour into insulation or wiring.
If you can’t safely hose from outside, use a second bucket of clean water and a separate microfiber cloth to rinse suds. Work methodically so you’re not spreading soap residue.
Squeegee for a Streak-Free Finish
With your squeegee attachment on the extension pole, start at the top corner of each pane.
Pull the squeegee straight down in one smooth stroke. Immediately wipe the rubber blade with a clean, lint-free cloth.
Overlap each stroke by about 10%, working left to right or right to left until the pane is clear.
Wipe Frames and Sills
Dip a microfiber cloth in plain water and wring it out well.
Wipe down the window frame, sill, and any hardware (hinges, cranks). This removes lingering dirt and helps prevent rust or rot around moving parts.
Inspect Seals and Caulking
Check the perimeter of the window where the frame meets the roof or exterior wall.
Look for cracked, peeling, or missing caulk. If you spot gaps, plan to reapply exterior-grade silicone caulk after the frame dries completely.
Dry and Ventilate
Use a dry microfiber towel to blot any remaining drips inside the attic.
Keep the attic well-ventilated for a few hours so any residual moisture evaporates—this helps prevent mold in insulation and rafters.
Special Considerations for Different Attic Window Types
Skylights
Work from the roof whenever possible, using a sturdy ladder and buddy system.
Use a soft-bristle brush to remove loose debris (leaves, pine needles) first, then proceed with the cleaning steps above.
Dormer or Gable Windows
If they’re small, you may be able to open them and lean out from inside to clean the exterior. Always secure the window in the open position first.
For exterior cleaning, use a ladder stabilized against the dormer face—never put a ladder on the roof slope itself.
Fixed (Non-Operable) Windows
Clean through the attic side, using your extension pole squeegee and brushes.
Rinsing may be more challenging; use distilled water on a microfiber cloth to reduce streaks if you can’t rinse externally.
Maintenance Tips to Keep Attic Windows Clear Longer
Quarterly Dust-Down: Even if you don’t do a full wash, dust off frames and mullions every few months.
Trim Overhanging Branches: If branches hang over your roof, falling leaves and sap can land on skylights. Keeping them trimmed back minimizes debris.
Check Flashing Annually: Poorly sealed flashing around skylights or dormers can let in moisture, leading to dirt build-up inside the window jamb. If you spot leaks or rotting wood, address immediately.
Seasonal Cleaning: Aim to deep clean attic windows in spring (after pollen season) and fall (before winter ice). This prevents seasonal grime accumulation and seal damage.
When to Call the Pros
Hard-to-Reach Locations: If a window sits above a steep pitch or over a tall staircase, professional window cleaners have harnesses, roof jacks, and safety gear to handle it safely.
Heavy Stains or Hard Water Spots: Mineral deposits or old paint overspray might require specialized de-ionized water systems or razor-blade techniques that professionals provide without scratching the glass.
Seal or Frame Damage: If your attic window frame is rotting, warped, or the seal has failed (you’re seeing fog between double panes), it’s time to consult a window installation specialist.
Conclusion
Cleaning attic windows can feel like a chore, but with the right tools, a clear plan, and an emphasis on safety, you can restore bright, welcoming light to your upper rooms. By following our step-by-step process—dusting, washing, squeegeeing, and inspecting seals—you’ll maintain your windows’ appearance and performance for years to come. If you’d rather leave it to professionals, the team at TLC: Making It Easy has the experience, equipment, and confidence to tackle even the highest skylights or trickiest dormer windows. Contact us today to schedule attic window cleaning or learn more about our complete suite of home-exterior cleaning services.