How to Clean Sash Windows: Step-by-Step Guide

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Experts in Sash Windows Repair & Restoration, Timber Windows & Timber Doors in east midlands

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Sash Windows Refurbish specializes in providing repair and restoration services for wooden windows and doors in the UK, as well as various types of carpentry. During the process of fulfilling orders, we utilize a range of tools and paints, including saws, sprays, primers, resins, and adhesives. With more than 20 years of experience in carpentry, we have tested and used various brands and types of work tools, making us well-equipped to offer helpful advice on selecting the right tools and paints for your needs. Read more ...

You will need the following items:

  • Soft or microfibre cloth
  • Squeege/dry cloth – to wipe clean
  • Glass cleaning spray (for interior glass)
  • Dishwashing liquid and water mix (for exterior glass)

Instead, opt for a natural cleaning spray made from diluted vinegar and lemon juice, which is eco-friendly and environmentally safe.

Timing Your Sash Window Cleaning

Timing is crucial when it comes to cleaning your sash windows. Choose a day when the weather is mild and dry, ensuring that your cleaning efforts won’t be in vain due to rain or excessive humidity. Cleaning your windows on a sunny day also allows the cleaning solutions to dry effectively, leaving your sash windows gleaming.

Ensuring Safety While Cleaning Windows

Before you start cleaning, prioritize your safety. Use a sturdy ladder and make sure it’s placed on a stable surface. If your windows are on higher floors, consider using an extension pole with a secure window cleaning attachment. Always wear appropriate safety gear, including gloves and safety glasses, to protect yourself from cleaning solution splashes and debris.

Effortless Cleaning of Classic Sliding Sash Windows

Cleaning classic sliding sash windows can be effortless if you follow a systematic approach. Start by removing dirt and debris from the window tracks using a soft brush or vacuum cleaner attachment. Next, prepare a mild solution of water and a few drops of dish soap. Use a soft sponge or microfiber cloth to gently scrub the window frames and glass. Avoid using abrasive materials that could scratch the glass or damage the paint.

Ideal Cleaning Products for Sash Windows

Choosing the right cleaning products is essential for sash window maintenance. Opt for mild, non-abrasive cleaners that won’t harm the wood or uPVC material. Vinegar-based solutions are excellent for cutting through grime and leaving your windows streak-free. Alternatively, you can purchase specialized window cleaning solutions designed for sash windows. Always read the labels and choose products that are safe for your window material.

Cleaning Various Styles of Sash Windows

Different styles of sash windows require specific cleaning techniques to ensure their longevity and aesthetic appeal.

Wooden Sash Windows

Wooden sash windows exude a timeless charm but require regular maintenance to prevent rot and decay. Clean wooden frames with a mild detergent solution and a soft brush. Seal any gaps or cracks with appropriate wood filler and repaint the frames to protect them from the elements.

uPVC Sash Windows

uPVC sash windows are low-maintenance but still need occasional cleaning to stay pristine. Use a mild soap solution and a soft cloth to wipe down the frames and glass. Avoid abrasive cleaners that could scratch the uPVC surface. Regular cleaning will keep your uPVC sash windows looking new for years.

Single-hung and Double-hung Sash Windows

Single-hung and double-hung sash windows have moving parts that require special attention. Lubricate the pulleys and tracks with silicone-based lubricant to ensure smooth operation. Clean the channels with a soft brush to remove debris that might hinder the movement of the windows. Regular maintenance will keep these windows functioning correctly and enhance their longevity.


How do you clean secondary glazing on sash windows?

Cleaning secondary glazing on sash windows involves a few simple steps. First, gather mild soapy water and a soft cloth or sponge. Gently wipe down the secondary glazing, avoiding abrasive cleaners that could damage the surface. For stubborn stains, a mixture of vinegar and water can be effective. Finish by drying the glazing with a clean, lint-free cloth to prevent streaks and maintain clarity. Regular cleaning ensures the secondary glazing remains transparent and functional, enhancing the overall appearance of your sash windows.

About the author

Glen Ramsey, who presently holds the positions of customer support and content manager, is a cherished member of the Sash Window Refurbish team. He is in a unique position to provide advice on all questions pertaining to the renovation of historic windows because he has a wealth of experience in all elements of window renovation, dealing with clients regularly and assisting them in choosing the best window-related course of action. He oversees the creation of information for all of our platforms in his capacity as content manager, including web content and other materials. Glen has witnessed the whole gamut of Sash Window Refurbish's window restoration activities, from our work on significant listed Georgian homes to a wide variety of smaller-scale private residential projects.


My technician Andrew replaced all my sash windows that had rotten sills. Accessing the rotten sills was not an easy task. He explained to me what needed to be done in order to fix the problem. He is a great person and I’m happy that he was the one who did the job. He is reliable, tidy, friendly and very professional. I highly recommend him.



I hired Andrew and Alex a while back to repair my damaged sash windows. They were was very considerate and very patient as he did his job. A few days ago, I had another problem with one of my sash lock keys and I called him again to come and fix the problem. I’m very impressed that Liam responded quickly and he not only fixed the problem but he also gave me a spare key. What a great after sales service!

Alan W.


I’m very impressed with the new windows that Andrew installed and also the reconditioning job that he did on other sash windows. The quality of his work is by far more superior than what we got when we hired another company a few years back. We will certainly hire him again if any window work arises

Kelly (Sleaford)


Our decorator referred us to Andrew because some of the work needed a window expert. Andrew together with our decorator did a fantastic job. The work was done efficiently and to the highest standards. Andrew is understanding, committed and very professional. I recommend him without any hesitation.

Steaven Reader


Alex did a great job in fixing windows in our terraced house. The windows were broken, frames damaged and the wood was also rotten. Alex's job was high quality and he did it pretty fast. I was also very impressed that he was considerate of my son’s asthma condition and maintained cleanliness. Top work.



Andrew just recently replaced three sash windows in my Edwardian house. He also repaired and replaced some sills and draught proofed three windows. In addition to that, he also did some carpentry work. What I like the most about Liam is that he did a clean job. He is very professional and always updated me about the timescales and costs. He also did his job with minimal disruptions. I highly recommend him.

Cris M.