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How To Remove Mould From Upvc Window Frames

Homeowners want to get rid of smelly, unpleasant mould on upvc windows. Because, they can pose serious breathing and skin issues. They want to remove mould as soon as possible.

 I’ve been removing mould from all types of windows professionally, I understand how toxic these mould can be for you. You should try to remove them by yourself. You can also hire a professional for your help. However, if you want to know how to remove mould, you can get all the necessary information in this article!

What causes mould on uPVC windows?

Mould is microscopic fungus growth upon favorable conditions. Condensation, humidity, damped area, and poor ventilation in your place are favorable conditions for mould growth.

What causes mould on uPVC windows frames?

Mostly, mould grows on the window sills because there is condensation. Also due to rain water leakage, the area is also damped which favors mould growth. Additionally, timber window frames are more prone to mould growth. However, upvc windows with dust and dirt can be a food source for mould.

What causes mould on silicone sealant? 

You use waterproof silicone sealants to fill the gaps in the frame. But, if there is any left gap, water can seep through and promote growth of mould. 

What causes black mould on your silicone sealant?

Black mould is the mould type that is caused due to dampness and humidity in window sills. It is not that harmful, as is rumored to be.

Why must you remove mould from your home? 

The harmful impacts of mould on health and home cannot be denied. You must remove mould because they can prove to be very dangerous for you, your kids and other family members. Infants, old people, people with weakened immunity, skin, and respiratory issues are more vulnerable to them. If you inhale, ingest, or touch the allergens and toxic irritants released by them, you may get sneezing, coughing, or skin allergy.

In particular, mould on windows is dangerous, because you’ll get exposed to them on a regular basis. Also, fresh air coming through them can get contaminated with these mould, posing serious problems.

How to identify mould on your uPVC window frames?

Mould are tiny fungal microorganisms that usually appear as white or black dust particles. Their size increases gradually and their colonies become visible. Discolored spots and condensation on your window frames are two key identification markers of mould. As soon as you notice these markers on the window, try to get rid of them before they bring destruction. You can also detect their specific unpleasant socks like smell.

There are greater chances of growing mould in a humid environment. If you see greenish, brownish, grayish hues on your window frame, it means there is an onset of mould growth. Black spots reflect black mould, while white crystalline reflects growth of white mould. 

How to remove mould off your uPVC window frames?

You can clean window sills and other surfaces affected by mould following these simple steps:

Allow Plenty Of Fresh Air Into Your Rooms

Before starting to remove mould, fully open windows to let fresh air in and improve ventilation. It will also reduce that unpleasant sock-like smell of mould.

What are the most effective cleaning methods for removing mould?

You must remove mould using an effective cleaning method to restrict the growth of mould on windows.

Use Washing-Up Liquid 

You can utilize a solution of washing liquid and water to remove mould.

  •  Apply this solution on the mould and rub it using a brush. 
  •  Then, give it a rest for almost 10 mins.
  • Lastly,  wipe it with clear water. 
  • But, make sure to remove all the mould residues completely.

Try Vinegar

You can also use white vinegar as an alternative choice to remove white as well as black mould. White vinegar is proven to be effective against fungus species that promote mould growth. Cleaning process to remove mould using vinegar is simple. 

  • Apply and leave vinegar on the mould area for almost 10 hours.
  • Then, wipe it using a damped cloth.

Precautionary measures:

You should take following precautionary measures while cleaning;

  • Wear a mask and gloves to prevent inhaling of mould and irritation to your skin.
  • Rinse thoroughly with water to remove all the left mould.
  • Immediately change your clothes after completion of the process.

When should you hire a professional for mould removal?

Sometimes, mould continuously reappears after removal. Now, it is the time to hire a professional who will help you out to find root causes of mould. They will use advanced tools and techniques to remove the mould thoroughly, without leaving the residues. 

How to prevent growing mould on your uPVC windows?

Obviously, you want mould to never come back after removing them. You can prevent re-growth of mould in future by using dehumidifiers and by improving ventilation.

Using Dehumidifiers

Dehumidifier is a powerful tool to stop mould growth. They will remove mositure from air and push moisture to their system in which moisture is condensed to liquid collected in the tank. Moisture free air will not support growth of mould on your upvc windows. .

Importance of Ventilation

In a properly ventilated area, water disperse and does not condense. Thus, ventilation does not allow settling of water in sills and inhibits growth of fungus.


Mould on upvc windows can cause skin and respiratory issues to infants, elders, and already weakened persons in your home. So, you must get rid of these smelly mould as soon as possible. You can use vinegar and washing liquid to effectively remove mould.


How do you remove black mould from silicone sealant around windows?

You can simply remove by applying and gently scrubbing vinegar and water mixture on sealant using soft-brush.

What causes black mould on uPVC windows?

Condensed and damped environments with humid air are ideal conditions for mould growth.

How do you remove black mould on window frames?

You can effectively remove black mould using vinegar or washing liquid..

How do you remove brown stains on uPVC window frames?

You can remove brown stains by applying and gently rubbing a mixture of baking soda in water on the upvc window frame

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