How to Clean Roof Windows: A Simple Care Guide

Quick answer

Clean roof window glass with warm water and washing up liquid, or a non-abrasive glass cleaner. Wipe frames with a damp cloth. Clean or replace the air filter every few months. Avoid sharp tools and harsh chemicals, as these can damage seals and coatings. Aim to clean roof windows two to three times a year, and check seals and filters at the same time.

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Why roof window care matters

Roof windows take more punishment than standard windows. Rain, sun, wind and debris hit them directly, so dirt, mould and wear build up faster. A few minutes of regular care keeps them looking good, working smoothly and lasting longer, and helps you avoid costly repairs down the line.

Know your roof window type first

How you clean a roof window depends on how it opens.

Centre pivot windows rotate up to 180 degrees, so you can clean both sides from inside without climbing onto the roof. Most also have a built in air filter, which is worth checking each time you clean.

Tilt and turn windows open via a handle at the base of the sash. Release the upper hinges and the sash swings open, making cleaning straightforward from indoors.

Top hung (tilt up) windows pivot from the top of the frame. These need to be fitted at a height you can comfortably reach, or they become harder to clean safely.

Triple glazed tilt up windows often use springs or actuators to hold their position. Fitting these in pairs makes cleaning easier and safer.

Not sure which type you have? Browse our full range of roof windows to check your model, or get in touch and we'll help you identify it.

What you need to clean roof windows

• Warm water and washing up liquid, or a non-abrasive glass cleaner
• A splash of vinegar for extra shine, if preferred
• A microfibre cloth or paper towel
• A plastic squeegee with a silicone edge, for a streak free finish
• A soft cloth for the frame
• A ladder or telescopic pole for hard to reach spots

Avoid: sharp scrapers, abrasive pads, and strong chemical cleaners. Many roof windows have a self-cleaning or protective coating, and harsh products can strip it.

How to clean the inside of a roof window

1. Open the sash using the slider in the frame so you can reach both sides of the glass.
2. Remove the air filter and clean it, or replace it if it looks worn.
3. Wash the glass with your cleaning solution, using a soft cloth or squeegee. Skip anything with sharp or metal edges.
4. Dry the glass with a squeegee or clean cloth to avoid streaks.
5. Wipe the frame with a damp cloth, then close the window using the same slider.

How to clean the outside of a roof window

The outside pane usually needs a bit more care.

• Open the window fully using the slider before you start.
• Pick a dry, overcast day. Direct sun dries cleaning solution too fast and leaves streaks.
• Check seals are intact before you begin, to stop water getting into the room.
• Use a ladder or telescopic pole for windows you can't reach safely by hand.

If a window sits high up or at a tricky angle, it's safer to bring in a professional than to stretch or overreach.

Caring for the frame

Small chips or discolouration on a frame should be dealt with quickly, before moisture gets in. A repair varnish from your window supplier or manufacturer will cover minor damage.

For general dirt, a damp paper towel is usually enough.

Wooden frames need more attention. Refresh the coating roughly every five years: sand the surface back, apply a primer, let it dry fully, then seal with a waterproof varnish or paint.

Cleaning the air filter

Dust and insects build up in air filters over time. A hoover, water and a bit of detergent will usually clear it out. Open and lock the sash in the inverted (cleaning) position to access the filter, and replace it if it's visibly worn. Clean the ventilator at the same time.

Need a replacement filter or ventilator part? Check our roof window accessories and spares for the right fit.

Removing mould and stubborn stains

Mould on frames is more than an eyesore, it can affect air quality too. A mix of water and vinegar, or water and hydrogen peroxide, tackles most mould and stubborn stains effectively. For heavier build up, a specialist mould remover will do the job. Regular cleaning is the best long term prevention.

Self-cleaning glass: what it actually does

Self-cleaning glass uses UV rays to break down organic dirt, then a hydrophilic coating lets rain wash the residue away without streaking.

It cuts down how often you need to clean, but it doesn't remove the need entirely. Give the glass an occasional manual clean for anything the coating misses, and stick to gentle, non-abrasive products so you don't damage the coating.

Preventing condensation and damp

Ventilate rooms with roof windows at least three times a day, for five minutes each time. This stops moisture settling on the glass, which can lead to damp and mould, and, in wooden frames, warping. This matters even more in new or newly built spaces, where materials release more moisture as they settle.

DIY or call a professional?

Most roof window cleaning is a straightforward DIY job. Call in a professional once a year, or whenever:

• The window is high up or at a difficult angle
• You need seals, filters or ventilators checked or replaced
• You want a full inspection alongside the clean

FAQs

How often should I clean roof windows? Two to three times a year for a standard clean, with a filter check each time.

Can I use normal glass cleaner on roof windows? Yes, as long as it's non-abrasive. Avoid anything with solvents or abrasive particles, especially on self-cleaning glass.

Why is my roof window frame going mouldy? Usually poor ventilation and trapped moisture. Ventilate the room regularly and clean the frame with a water and vinegar solution to keep mould from returning.

Do self-cleaning roof windows still need washing? Yes, occasionally. The coating handles most organic dirt, but not everything, and not on the inside pane at all.

Is it safe to clean roof windows myself? For accessible windows, yes. For anything high up or awkward to reach, use the right equipment or bring in a professional.

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Looking after your roof windows for longer

Whether you're maintaining an existing installation or planning a new one, choosing the right roof window from the start makes ongoing care easier. Explore YARD Direct's roof window range for models built for easy cleaning and long-term performance, or get in touch with our team for advice on parts, filters and accessories.