How to clean VELUX windows — plus whether pressure washing them is ever a good idea

They may bring plenty of natural light into your home, but VELUX windows have a habit of collecting their fair share of dust, streaks and the occasional splattered bug. What's more, these types of windows are often perched just out of easy reach, meaning it can be difficult to give them the attention they require.

But cleaning VELUX windows doesn’t have to be a daunting task if you know what you're doing. In fact, with the right tools and a few clever tricks, you can get yours gleaming again without calling in the professionals.

Whether you're dealing with stubborn water marks or just giving your windows a quick refresh for the sunnier months, a little know-how goes a long way. We spoke to window cleaning experts to get their top tips, so you can clean your VELUX windows safely, thoroughly and with confidence.

How to clean VELUX windows from the inside

"When cleaning VELUX windows, it's all about safety and efficiency," explains Scott Schrader, cleaning expert at CottageCare. "You can clean both sides of the window safely from inside your house." VELUX windows are designed to rotate 180 degrees, allowing easy access to both sides of the glass without stepping outside. Simply unlock the top control bar and rotate the window until it locks into the cleaning position. This clever design makes it much easier – and safer – to achieve a streak-free finish.

"When it comes to cleaning the inside of any non-vertical glazing, whether that be a VELUX style window or a flat roof light, or a glazed lantern, we would always recommend spraying glass cleaning liquid onto a soft, lint-free cloth and working from the centre towards the edges of the glass," adds Edward Stobart, technical sales manager at IDSystems .

"Working in circles helps to disperse smears," he adds, "whilst frequently changing the areas of the cloth that you use will help remove dirt and debris."

Scott Schrader

Scott Schrader is the Chief Marketing Officer at CottageCare, a leading home cleaning company with over 41 locations.

Edward Stobart

A long serving member of the IDSystems team, for the past 20 years Edward has advised and supported self-builders and renovators to identify the most suitable glazing options for their project.

How to clean VELUX windows from the outside

You should be able to access both sides of a VELUX window from inside your home, but you can also clean them from the outside using an extendable squeegee or a water-fed pole from the ground, explains Scott Schrader. These tools are ideal for reaching upper windows safely, especially if you’re not keen on climbing ladders.

To keep your windows spotless for longer between cleans, Edward Stobart also recommends opting for a self-cleaning glass coating when you order new windows or a glass roof.

"Self-cleaning glass operates by acting as a barrier between the glass and rainwater or dirt that comes into contact with the window or roof,” he explains. “The coatings work by pooling water into droplets which then roll down the surface. Organic matter is then broken down by sunlight, which is removed when it rains or by spraying with a hose."

Suggested products and tools

"The best products to use for cleaning VELUX windows are mild detergent with warm water, microfibre cloths, and a soft-bristled brush," advises Scott Schrader. But he cautions again using aggressive chemical cleaners or harsher detergents because they can damage the glass or window frames.

A handheld squeegee is another popular choice, as these tools help to remove excess water without leaving streaks and make it easier to achieve a crystal-clear finish with minimal effort. Just remember to wipe the blade between strokes to avoid dragging dirt back across the glass.

"If you’re cleaning windows externally, always use a safe and stable ladder/extendable cleaning equipment," adds Scott. "If you are uncomfortable using a ladder and working at height, please hire a professional. You should never lean out or stretch from a ladder - your safety always comes first."

FAQs

How often should you clean VELUX windows?

"I suggest that you thoroughly clean your VELUX windows every 3-6 months depending on where you live," recommends Scott Schrader. "Doing regular maintenance means that you will avoid built-up grime and that you keep the glass clear and bright."

Aim to clean your windows on a cloudy day or when the glass is cool to the touch. Cleaning in direct sunlight can cause water or cleaning solutions to dry too quickly, leading to streaks and smears.

Can you use vinegar to clean VELUX windows?

Yes, you can use a diluted vinegar solution to clean VELUX windows and it’s especially effective for tackling hard water stains. To make your own, mix one part white vinegar with two parts warm water and apply with a microfibre cloth. However, avoid using vinegar on wooden frames or self-cleaning glass, as it can damage coatings or finishes.

What's the best way to clean VELUX window frames?

For uPVC or painted timber frames, a soft cloth and a mild soap solution are all you need. Avoid abrasive sponges or harsh cleaning products, as these can damage these surfaces. You should also wipe down the frame as part of your regular cleaning routine to prevent dust and grime from building up around the edges.

Can I use a pressure washer on VELUX windows?

It’s best to avoid using pressure washers when cleaning VELUX windows, as the intense force can damage seals, compromise protective coatings, or even crack the glass. For a safer alternative, use a garden hose with gentle pressure to rinse from the outside, or opt for a soft cloth and water-fed pole for greater control. If you do choose to hire a professional, they’ll come equipped with specialist tools and techniques to get the job done safely and thoroughly.

This cleaning guide also works for other rooflight types and brands, and is the same for double glazed units as it is for triple glazed windows, though it’s always worth checking manufacturer advice on suitable cleaners and how the window opens. And, if your considering VELUX windows for your loft conversion ideas, be sure to take a look at the other types of loft conversion windows available too.