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Remove Black Marks from uPVC Doors and Windows 

Indeed, uPVCs are durable and easy to maintain, but it is also true that everyday dust and dirt leave black marks on them and make them look dull or awful. That is why it is necessary to remove black marks from uPVC doors to keep them fresh and bright.

In this regard, learning how to remove black marks from uPVC doors before cleaning is essential for perfect results. Moreover, understanding their causes and taking precautions will help you do this effectively. 

Let’s brighten your uPVC door and windows together!

Causes of black marks on uPVC 

The black marks on uPVC doors may be formed because of the following reasons;

Weather exposure

The unfavorable weather is the major cause of black marks on uPVC because prolonged exposure to harsh weather conditions leaves black marks on uPVC surfaces. Furthermore, rain, wind, and UV rays degrade the substance over time and let dirt or mud accumulate more quickly. 

Air pollution

On the other hand, in cities, smoke and pollutants from vehicles and factories leave dark stains and patches on uPVC surfaces, and over time these build-ups make the uPVC look dirty and discolored.

Mold and mildew

Mold and mildew grow in humid places, so if there’s any moisture around uPVC doors and windows, they grow there and cause black marks if not treated on time. Regular cleaning and ventilation can prevent this from happening.

Precautions for removing black marks

When you remove black marks from uPVC doors, consider the following precautions;

  • Use only soap and water for minor stains instead of abrasive cleaners such as bleach.
  • For stubborn stains try a mixture of vinegar and hot water, which is best in removing grease. Alternatively, you can use a specialized uPVC cleaner but vinegar and water work just as effectively. 
  • Before applying the solution, perform a small test on a targeted area to check if the cleaner affects the surface.

Materials Needed

You need to gather the following materials before cleaning;

  • A soft cloth or microfiber towel
  • Warm water
  • Mild detergent or uPVC cleaner
  • A vinegar or lemon juice for tough stains
  • A sponge or soft brush
  • Rubber gloves

Steps to remove black marks from uPVC doors and windows

You can get rid of black marks on uPVC doors and windows by following the steps below;

Prepare your uPVC

Initiate by making sure the uPVC doors and windows are cool and out of the reach of direct sunlight.

Prepare a cleaning solution

Afterward, mix a mild detergent with warm water or use a specialized uPVC cleaner and ensure it’s gentle on the surface.

Apply the solution

Now, dip a soft cloth or non-abrasive sponge into the cleaning solution, then apply it to the black marks of the uPVC sill and frame.

Scrub gently

Then, gently scrub the affected area using a cloth or sponge in a round motion, and avoid doing it forcefully to prevent scratches.

Rinse thoroughly

After scrubbing, rinse with clean water to remove any remaining cleaning solution and dirt.

Dry the Surface

Finally, use a separate soft cloth to dry the surface completely. This step prevents water spots and streaks, ensuring your uPVC doors and windows are clean and refreshed.


Once the surface is dried, give it the final touch by checking for leftover marks or stains over them. Clean again or retreat the spots gently if required.

Follow these steps to remove black marks from uPVC doors for a long time.

Challenges While Removing Black Marks from White uPVC

Remember, cleaning black marks from white uPVC doors and windows is challenging because of

  • The color contrast between black marks and white uPVC, so you need to clean them well.
  • Also, stubborn stains take longer and need extra effort to vanish away.

Additional Maintenance Tips

We have presented additional maintenance tips for uPVC doors to boost their longevity, and these are as follows;

  • First, regularly clean uPVC windows and doors at least twice a year to avoid the buildup of dirt and stains.
  • Furthermore, applying uPVC protectant or wax after cleaning filter dirt maintains the uPVC’s appearance and improves their overall condition.
  • In addition, keep trees and shrubs trimmed to prevent fluid and debris from falling onto the uPVC surface.
  • Also, ensure the seal around doors and windows is solid to prevent water access which may lead to mold and mildew.


In short, by implementing our strategies, you can successfully remove black marks from uPVC doors, maintain their appearance, and keep them safe. So, include these practices in your monthly cleaning routine to make your uPVC doors and windows last longer and function better.


How do you remove black marks from plastic?

First, make a paste by adding baking soda with water and put it on the discolored areas of the plastic matter. Now, let it sit for twenty to thirty minutes. Then, use a damp cloth to wipe the container. At last, rinse and dry it.

How can you remove burn marks from uPVC windows?

First, try using a T-cut to address any discoloration or minor blistering on the surface. If this doesn’t resolve the issue, cautiously remove a thin layer using a sharp chisel, then smooth it with wet sandpaper. Next, apply cutting paste followed by more T-cut to achieve a smooth finish.

Can you use sugar soap on uPVC windows?

Yes, sugar soap is effective for removing grease and grime from the uPVC.

What is the best cleaner for uPVC?

“Rhino Goo” is, so far, the best uPVC Cleaner.

How do you clean a black uPVC door?

To clean a black uPVC front door, soak it with soapy water or spray it with warm water and white vinegar mixture, then wipe it clean after a few minutes.

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