Internal vs External Window Cleaning: What’s the Difference?

Internal and external windows don’t just get dirty in different ways — they’re cleaned in different ways too. What works well inside a property isn’t always suitable outside, and vice versa.

From the tools used to how the glass is dried, the method matters. Knowing these differences makes it easier to understand what you’re paying for and why professional window cleaning delivers more consistent results than a one-size-fits-all approach.

What Internal Window Cleaning Involves

Internal window cleaning focuses on the glass inside your home or building. These windows aren’t exposed to rain or pollution, but they still pick up marks over time.

Fingerprints, condensation, cooking vapours, and general handling all leave subtle traces on glass. You might not notice them straight away, but they slowly dull the glass and reduce the amount of light coming through.

This type of cleaning is usually done using traditional hand-cleaning methods. It gives better control in indoor spaces and allows professional window cleaners to work carefully around furniture, flooring, and fixtures. It’s also the best way to make sure edges and corners are properly finished without leaving drips behind.

What External Window Cleaning Involves

External window cleaning comes with its own challenges. Outside glass is constantly exposed to the elements, and in London, that means traffic pollution, dust, rain, and wind all play a part.

Rain doesn’t clean windows as much as people think. In fact, it often leaves behind residue that slowly builds up. External window cleaning is about removing that build-up properly, not just improving how the glass looks for a day or two.

Depending on the property, access, and window type, external cleaning may be done using traditional methods or water-fed pole systems with purified water. The method changes, but the goal stays the same: clean glass, frames, and sills with no residue left behind.

The Main Differences Between Internal and External Window Cleaning

Although both services aim for clear, bright windows, they deal with very different issues.

Some of the key differences include:

• Where the dirt comes from: internal marks usually come from everyday use, while external dirt comes from pollution and weather

• How the windows are cleaned: internal cleaning relies on hands-on techniques, while external cleaning may involve poles or other access methods

• How the glass dries: internal windows are dried by hand, while external windows may be left to air-dry when purified water is used

These differences are exactly why internal and external window cleaning aren’t interchangeable.

Why Internal Window Cleaning Matters

Internal windows have a bigger impact on a space than many people realise. When glass is clean, rooms feel brighter and more open. When it isn’t, even subtle marks can make a space feel dull or tired.

In homes, clean internal windows help natural light move through rooms more freely. In commercial settings, they contribute to a cleaner, more professional environment for staff and visitors. It’s one of those details that often goes unnoticed when it’s done well, but stands out when it isn’t.

Why External Window Cleaning Is Just as Important

External window cleaning isn’t only about appearance. Dirt, residue, and pollution can slowly build up on glass and frames if they’re left untreated.

Regular external cleaning helps prevent staining, keeps frames and sills in better condition, and maintains the overall look of the property. This is especially important in busy London areas, where windows tend to get dirty faster due to higher pollution levels.

How Often Should Each Be Done?

There’s no universal schedule that suits every property. Internal windows usually need cleaning less often, especially in quieter homes or offices. External windows, on the other hand, tend to benefit from more regular attention because of constant exposure to the elements.

Location, foot traffic, building height, and personal or brand standards are factors you should also consider when deciding when to book your next window clean. A professional cleaner can help you find a schedule that keeps both internal and external windows looking good without overdoing it.

Why Professional Window Cleaning Makes a Difference

While light cleaning at home can help in between visits, professional window cleaning ensures the job is done properly from top to bottom.

A professional window cleaner in London understands how local conditions affect glass and knows when to use traditional methods and when a different approach is more effective. It’s not about using one system for every job, but choosing the right method for each window.

At The Riviera Group, we carry out both internal and external window cleaning using traditional hand-cleaning techniques and professional systems where appropriate. This allows us to deliver consistent, high-quality results across residential and commercial properties in London.

If your windows are starting to look dull or you want to keep them looking their best throughout the year, booking a professional clean removes the guesswork. Get in touch with us today and enjoy clear, well-maintained windows inside and out.