Living in the UK, your uPVC window frames are exposed to all sorts that can leave stains and marks over time. The most common culprits are good old British rain mixed with air pollution, which can create grimy build-up and water streaks, especially if you’re near busy roads.

Bird droppings, tree sap and green algae are also regular offenders, particularly if your windows face gardens or leafy streets. And if you’re coastal, salty sea air can cause white streaks and residue on your uPVC. Add in everyday dust and pollen and it’s no wonder frames need a bit of love now and then!

uPVC is tough, but British weather can leave its mark. Regular cleaning not only keeps things looking fresh but also stops stubborn dirt and stains from sticking around. Plus, clean frames mean your windows last longer and work better. Win-win.

What You Need to Clean uPVC windows

• Soft cloths or sponges
• A bucket of warm, soapy water (we recommend using mild washing-up liquid)
• Old toothbrush or small soft brush
• White vinegar (for tough stains)
• Spray bottle
• Dry towel or microfibre cloth

Avoid using Bleach, scouring pads or harsh chemicals as they can damage the uPVC and will make it look a bit terrible.

How to Clean uPVC Window Frames

1. Dust Off First

Before you get things wet, brush away any loose dirt and cobwebs. Use a dry cloth or soft brush, especially in corners and seals. This may seem obvious but removing the dry dirt will make the actual cleaning process significantly easier.

2. Get Soapy

Dip your cloth or sponge in the warm, soapy water. Wipe down the frames, starting from the top and working your way down. Don’t forget the tricky bits around hinges! Starting from the top will mean gravity helps you to cover more material and remove the dirt more easily.

3. Tackle the Tough Stuff

For stubborn marks, mix a bit of white vinegar with water in a spray bottle (about 1 part vinegar to 4 parts water). Spray it on, let it sit for a couple of minutes, then gently scrub with your toothbrush. The slight acidity of the vinegar helps to remove more stubborn marks without damaging the uPVC.

4. Rinse and Dry

Wipe down with a clean, damp cloth to remove any soap or vinegar residue. Then, use a dry towel or microfibre cloth to finish up and leave the frames streak-free.

Quick Tips for Top Results

• Clean your uPVC window frames at least twice a year—more if you live near busy roads or coastal areas.
• Don’t forget the insides of the frames and the tracks—dirt here can mess with how your windows open and close.
• If you spot mould or mildew, tackle it early with a bit of vinegar and plenty of fresh air.
• If you clean the glass well, use glass-cleaner and a squeegee to guarantee the results are as crystal clear as possible.

Still Got Stains?

Some older marks just won’t budge. If your frames are looking a bit worse for wear, get in touch with our team at Windows & Doors UK for advice or to chat about replacement options.