how to remove mould from upvc window frames

How to Remove Mould from UPVC Window Frames and Sills?

how to remove mould from upvc window frames

I think you should like spring. It pleases you with brilliant meadows and blooming gardens. Yet, glorious sunshine makes all the hidden dust and grime visible. How to remove mould from UPVC window frames? While the smooth polymeric surface is effortless to wipe, it could be a no small task. Minging black or orange fungus penetrates all hard-to-reach corners. Several savvy tricks let you get it off without any health risks and worries.

How to Clean PVC Window Sills and Frames?

In late spring, you would like to spend more time outdoors in a park or on a beach. But, then, when the weather becomes warmer, and it’s not a tad rainy, every walk is so enjoyable. Yet, you might be a tad busy now. Various household chores, like cooking or ironing, take hours of your life.

Whereas you know, your best way to clean uPVC window frames? It’s great! It lets you avoid heavy, stomach-churning practices. But, of course, spring is a perfect time to deep clean the dirty windows. Plenty of sunshine and bright, warm weather make you have a good tidy-up.

Why Am I Getting Minging Black Mold All Around My Windows?

If you live in an old house, like a cottage or villa, it should be warm and comfortable. Thick brick walls, low ceilings and small-paned windows ensure its ace thermal comfort. Moreover, small windows are easier to clean than large-pane ones. Anyway, you should do it about every two weeks in spring and summer.

What about the insulation or thermal performance of your house? Above all, condensation and dampness could cause it. After that, it may appear on the inner surfaces of your windows, especially often in winter. Finally, high humidity levels may become harmful.

Does Lack of Ventilation Cause Mould?

After a cold, wet winter you may notice these minging dark spots. They appear around the edges of your pure-white window frame and spoil its blinding look. If it’s only dust or dirt, you wipe it off easily. However, mold or mildew is more difficult to remove.

What causes it? The difference between indoor and outdoor temperatures makes moisture condense. It accumulates on cold, smooth surfaces, like:

  • window panes;
  • mirrors;
  • kitchen or bathroom tiles;
  • metal or plastic window frames.

High indoor air humidity or poor ventilation lets harmful grow. But, conversely, it creates favourable damp conditions for your snug house infestation.

how to clean upvc window sills and frames at home

How Do I Stop Mould Growing around my Windows?

Inadequate ventilation and even excessive heating might be harmful. Polluted indoor air may affect your lungs, brain or overall health. Mould is also destructive, producing allergens and becoming toxic. The NHS recommends you prevent excess moisture. Especially if you are sensitive to these effects, follow the advice.

What should you do? Try to keep your cosy gaff dry and evenly warm. Can you minimize daily activities that cause steaming? I guess you won’t avoid cooking or bathing. Try to dehumidify the air or extract the steam, using a powerful fan.

How Do You Keep Windows from Getting Mould in the Winter?

In your welcoming home, you can find and eliminate all available sources of moisture. Fix a leaking pipe, avoiding overflows in your loo. Clean your ventilation channels, ducts, and grills to eliminate any blockages. Try to dry your clothes outside or use a laundry dryer.

Penetrating dampness makes difference. In winter, when indoor air is a tad dry due to heating, it still happens. Contacting cold or frosty outside air, your window glasses collect condensation. Are you wiping it off every day? Mild, dish soap could be not efficient in this case. Special, anti-fungal cleaners and agents are necessary.

Will Opening Windows Reduce Mould?

In winter, you should arrange adequate heating in your flat or house. Can you afford it? This year, when its cost is spiraling, it would be difficult. If you open a window or two, it doesn’t improve the situation. You definitely wouldn’t do it, when:

  • it’s raining or snowing outdoors;
  • outside air humidity is high (exceeding 60%);
  • it’s cold or dark outside.

Indoor temperatures in your rooms should be around 18 ºCelcius. Even in the daytime, you would keep your storm-beaten windows closed to save energy. In spring, when the weather is calm and dry, you can naturally ventilate your home. It reduces indoor air pollution and the risk of fungi growth in your snug gaff.

how do stop mould growing around windows

Different Colours/Types of Mould and Their Effects

There are several varieties of fungi common to old and new UK houses. Green one or penicillium affects cold damp walls and carpets. White fungus grows in cellars and basements, damaging timber structures and furniture. Blue variety may appear in your loo or bathroom if it’s continuously wet.

Black mold is especially harmful and toxic. It produces invisible mycotoxins able to affect your nervous and immune systems. So, you should remove it, as soon as you notice it. Can you do it by yourself? If the damaged area doesn’t exceed 1 sq. m., it’s possible.

How Do You Get Black Mould Off Window Frames?

Black fungus grows in damp and dusty areas, for example, around windows. It loves dark, cool environments with temperatures of 15-25ºC. Can you recognize it? Black mould is commonly slimy-looking, with a fuzzy, light texture.

Fortunately, it’s easier to remove than the other varieties. Do it, using:

  • soapy water;
  • distilled (white) vinegar;
  • specific mildew remover.

What about bleach? It’s commonly a tad effective in removing and killing mould. Yet, it doesn’t work on smooth uPVC surfaces. The toxic solution reacts with plastic. It damages the surface, discolouring it.

How Do You Keep Mould Off Window Seals?

Your durable PVC frames may only seem to be so durable and solid. But unfortunately, their smooth and moisture-resistant surfaces are vulnerable to certain chemicals. Cellulose or paint thinners, acetone-based solutions or mineral spirits melt the tough plastic. So do the sprays and mineral oils like WD-40.

Walls and rubber seals around your windows make a difference. Protect them from mould growth using brilliant antifungal paint. Above all, it kills harmful fungal spores and bacteria. In addition, the treatment prevents the recurrence of harmful black fungus. Keep in mind that it lasts for the nearest 5 years, at least.

How to Remove Black Mould from Silicone Sealant around Windows?

Special anti-mould sealants also exist. They have a blinding, clean finish. Their high weather and UV resistance are necessary for the application. Additionally, the sealant ensures proper adhesion with a PVC window frame. Install it to fix or prevent any possible fungi or damp issues.

Your old seals might be still vulnerable to mould. You can occasionally discover it in a new rented flat or house. Silicone has perfect water-resistant properties. Yet, it remains wet for a long time. Therefore, you may need to scrub it with a toothbrush from top to bottom.

how to remove black mould from silicone sealant around windows

How Do You Remove Mould from inside Double Glazed Windows?

If you have decided to replace your single-pane window structure, you are jammy. Double-glazed ones are tough to break and long-lasting. They make your gaff warmer and more secure. Does the installation cost a bomb nowadays? Don’t go spare. A double-glazed window pays its way, improving the insulation of your home.

Yet, a build-up of mould or condensation is a common issue. How do you prevent it? Every time you start cleaning the windows, remove the dust gently with:

  • a window squeegee;
  • sponge;
  • microfiber or soft cotton cloth.

Would you use a non-abrasive brush or a toothbrush? It’s necessary when the black staining is already visible.

Is Vinegar or Bleach better for Killing Mold?

Diluted bleach may seem to be an effective disinfectant. It kills bacteria, harmful viruses and other germs. What about fungi? Bleach kills only surface spores. It doesn’t stop the mould from growing back. On the other hand, vinegar is a safe, non-toxic cleaning agent.

It has brilliant antibacterial and antifungal properties. To use it on your PVC window frames:

  1. Get a spray bottle;
  2. Fill it with a mild water-vinegar cleaning solution;
  3. Spray it into the spots;
  4. Let it sit for about an hour;
  5. Scrub the surface, hoover, and rinse it with clean tap water. Leave the window frame to dry out.

White vinegar penetrates the surface, killing the fungus together with its roots.

What Is a Natural Way to Get Rid of Mould Spores?

Diluted white vinegar is 100% safe to use on uPVC surfaces. It’s acidic and corrosive, yet it doesn’t damage the plastic. In an extreme case, mix it with bicarbonate of soda. Together, they cause a reaction that boosts cleaning and bacteria removal. Anyway, you should protect yourself, wearing a face mask and rubber gloves.

But for the vinegar, there are 4 other natural disinfectants. They include hydrogen peroxide, hot water, and spirit (or vodka). Some kinds of essential oils are also efficient.

what naturally kills mold spores

Does Sugar Soap Remove Mould?

Sugar soap is a helpful and powerful cleaner. Use it to rejuvenate the uPVC frames or degrease them. It makes miracles, removing tough nicotine (tobacco) stains and grubby marks from smooth surfaces. Of course, you can clean mildew with it. Yet, it removes only the visible fungi, without killing the microscopic spores and germs.

A special mould remover is necessary. For example, it’s safe and eco-friendly based on citrus or tea tree essential oils. These products are blinding! Their bleach-free formulas are fast-acting and simple to use. Spray the liquid on the sleek PVC surface. Leave it for 10-15 minutes, and rinse the area.


Unfortunately, mould is a common problem even in new British houses, let alone older ones. As a result of the cold, rainy climate or poor ventilation, it may infect your home. Have you discovered it on your window seals or frames? Don’t worry. Use a natural household or a specially formulated cleaner to remove it.

It takes you only up to 15 minutes and the minging dark spots disappear. Your welcoming gaff is clean and healthy again.

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