A guide to cleaning uPVC windows and doors

Simon Edward • 2 January 2024

You've invested in beautiful new uPVC doors and windows. Would you like to keep them in showroom condition? Read on for top cleaning tips.


You've invested in beautiful new uPVC doors and windows. Would you like to keep them in showroom condition? Read on for top cleaning tips.

When fitting new doors and windows, there are many things to consider such as design, security, energy efficiency and cost. "Easy-to-clean" might be further down the list – but you'll appreciate its importance long after the windows have been fitted. 


We all lead busy lives and anything that can save us time and money in the long term should not be undervalued.

As uPVC is a non-corrosive material, it doesn't absorb moisture. This means it's easy to wipe clean because, unlike wood, it won't rot, warp or splinter.


But let's be realistic: anything that's open to the elements will sometimes need a little more TLC to keep it in tip-top condition. Here's how to do just that.


Cleaning equipment 


The beauty of cleaning a smooth surface is that you don't need an expensive box of cleaning products to maintain your windows.

A bucket of warm water with washing-up liquid, a sponge, a microfibre cloth and a brush (from a dustpan and brush set) is all the basic kit you need.


Additionally, white vinegar, a squeegee, a soft toothbrush, some scraps of old newspaper and a spray bottle will come in handy if you're planning a more thorough clean.


The cleaning process 


Start by dry brushing away any cobwebs and insects.


Fill a bucket with a solution of warm water and a little washing-up liquid. Using a sponge, apply water to the whole area, starting with the frames and then the glass.


Picture of someone cleaning windows with a sponge

An initial sweep will immediately loosen the dirt, revealing any stubborn marks like insect droppings. Use a soft toothbrush to get into the corners and scrub these off. 


A microfibre cloth (which is non-abrasive) will be useful here. It can remove these marks without scratching or damaging the surface.

Wipe off the water with a cloth or squeegee. Use a fresh cloth to dry the glass and wipe away residue and streaks.


To achieve streak-free perfection, use distilled water. 


Alternatively, fill a spray bottle with one part white vinegar to four parts water. Spray the glass and wipes the panes in a circular motion with scrunched-up newspaper. The acidic composition of vinegar is effective in breaking down the film that can build up on the glass over time. It also makes for an ecological alternative to chemical cleaners.


Cautions


uPVC is porous and therefore can stain. Beware: some detergents have hidden colourings in them.


An internet search will suggest a well-known cream cleaner – but this is abrasive. So, while it has many uses, cleaning the smooth surface of a uPVC window is not one of them.


Anything that can cause scratches will damage the surface, dull the shine and make it more difficult to clean in the future as dirt will become trapped in the scratches. 


So, on the banned list are:


  • Abrasive cleaning products
  • Bleach – or any cleaner with bleach in it
  • White spirit, which can stain white frames to brown
  • Solvents
  • Nail varnish remover
  • Scouring pads and wire wool
  • Scrapers and knives
  • Steam cleaners, which may damage the seals


Stick to washing up liquid and you'll have no problems.


Cleaning mould from your door and window frames


Sometimes a little bit more elbow grease is needed.


Mildew, mould, baked-on insect droppings or dead insects that seem to be welded to the window can pose a challenge. 

All can be successfully removed with the same products as before – but you'll need a little more patience. 


Use the same vinegar solution mentioned above. Spray the solution on the problem parts and wait for 10 minutes.


Picture of someone spraying a solution on a window

uPVC is water resistant, so the solution will sit on the surface and soften the offenders rather than soak into the frame.


Then, using your cloth and soft toothbrush, gently brush them away. 


Do the frames need a little re-whitening? 


White vinegar solution comes to the rescue again! Simply use the same process as before – apply the solution and give it 10 minutes or so to work its magic.


Remember the warnings we gave above. It might be tempting to use bleach but it won't produce the effects you might expect. Rather than whitening the window frames, it will make the discolouration worse and can damage the smooth surface.


Yellowing is caused by excessive exposure to UV light, so prevention is the key.


Wiping a window regularly with a vinegar solution will keep it looking fresh. This is especially important for south-facing windows.


Long-term cleaning and maintenance


We've focused so far on the maintenance of the frames and glass – but from time to time the other parts deserves some attention. 

Open the windows and clean inside the frames using the same methods as before. 


A toothbrush will be especially helpful here. It can help you clean hard-to-reach areas and the spots around the handles and hinges.


Picture of a toothbrush

Inspect the seals for any signs of damage. If you find tears or fraying, get the seal repaired as soon as possible. If in doubt, contact your window installer for advice.


How can you stop them getting in the dirty in the first place?


Given that we live in quite a wet and windy country, we can't prevent windows from getting dirty. The best option is to carry out some quick maintenance between cleans, regularly dry-brushing the frames to remove loose debris.


Fill a spray bottle with a water and washing up liquid solution. Lightly spray the microfibre cloth (don't soak it) and wipe the glass clean. Taking just a few minutes to reduce dirt build-up means that a deep clean will be quicker next time.


All crawling insects a problem? 


These type of insects dislike vinegar, so rinse out your spray bottle and fill it with your water-vinegar solution. Spray this around the edges of the windows to deter them.


A clean sweep


There's no doubt that uPVC doors and windows are easier and cheaper to maintain and keep clean. A regular cleaning routine will keep them looking fresh for years to come, enhancing the beauty of your home.


Here at Calder Windows, we've been fitting windows and doors for more than 30 years. If you're considering uPVC replacement windows, why not call in to our showroom and view our extensive range? Our friendly staff will be happy to advise you on the best products for your home.

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