How to Clean uPVC Windows and Doors Properly

The simple routine that works

uPVC needs very little looking after, which is a large part of why it is fitted to so many homes. For routine cleaning, a bucket of warm water with a small amount of washing up liquid, a soft cloth or sponge, and a separate dry cloth for buffing is all you need. Wipe the frame down, rinse with clean water, and dry it off to avoid streaks.

Start at the top and work down, and open the window so you can reach the rebate where the sash sits when closed. Dirt collects in that channel and around the hinges, and it is the part most people miss. An old soft toothbrush is useful for the corners and the drainage slots at the bottom of the frame.

• Warm water with a little washing up liquid
• Soft cloths or sponges, nothing abrasive
• Clean the opening rebate and hinge areas
• Clear the drainage slots at the frame base
• Dry and buff to avoid streaks

What to avoid on uPVC

The list of things not to use matters more than the list of things to use. Abrasive cream cleaners, scouring pads and wire wool will scratch the surface of the profile, and those scratches then hold dirt and show as dull patches. Solvent based cleaners, nail varnish remover, bleach and white spirit can soften or discolour the surface, especially on coloured and woodgrain foiled frames.

Pressure washers are best kept away from windows and doors altogether. The jet can force water past the seals, damage the gaskets and strip sealant lines. If you use one on the patio, keep the lance well back from the frames.

Glass, seals and hardware

For the glass, any household glass cleaner or a diluted vinegar solution works well. Clean on a cloudy day if you can, because direct sun dries the cleaner before you can wipe it and leaves streaks. A rubber squeegee gives the cleanest finish on larger panes and patio doors.

The rubber gaskets around the glass just need a wipe with the same soapy water. Hinges, handles and locking strips benefit from a light spray of silicone lubricant once or twice a year, worked in by opening and closing the sash a few times. Avoid thick grease, which attracts grit and can make stiff mechanisms worse over time. If a handle or hinge is already stiff or broken, cleaning will not fix it, and our guides to stuck handles and rusted hinges explain the repair side.

Stubborn marks and discolouration

Older white uPVC can pick up a grey film from traffic and weather, especially on the sides of the house facing a road. A dedicated uPVC cream cleaner, used with a soft cloth, will usually lift this. Test it on a small hidden area first, and be extra gentle on woodgrain and coloured finishes, where the surface is a foil rather than solid colour.

If the frame has gone yellow or chalky rather than just dirty, that is age and ultraviolet exposure rather than grime, and no cleaner will reverse it. At that point the honest question is whether the windows are near the end of their life anyway. Our guide to how long uPVC windows last covers the signs, and if the seals are failing or the units are misting as well, replacement is usually better value than endless cleaning.

How often and when

Twice a year is plenty for most homes, with an extra clean for the road facing side if it picks up traffic film. Homes near the coast, which covers much of the Wirral, benefit from more frequent rinsing, because salt spray left on frames and hardware accelerates wear on hinges and handles. Our windows for coastal homes guide goes into that in more detail.

While you clean, it is worth a quick look at the sealant line where the frame meets the wall, the condition of the gaskets, and whether any sealed units show misting between the panes. Catching a failed seal or a blown unit early keeps a small job small.

Common questions

Can I use a pressure washer on uPVC windows?

It is best avoided. The jet can force water past seals, damage gaskets and strip sealant. A bucket, cloth and hosepipe rinse are safer.

What removes yellowing from white uPVC?

Surface grime and traffic film come off with a uPVC cream cleaner. If the plastic itself has yellowed with age and sunlight, that cannot be cleaned away.

Is bleach safe on uPVC frames?

No. Bleach and solvent cleaners can soften or discolour the surface, especially on coloured and woodgrain finishes. Warm soapy water is enough.

How do I stop streaks on the glass?

Clean on an overcast day, use a squeegee on larger panes, and buff dry with a clean cloth rather than letting the glass air dry.

How often should I clean my windows and frames?

Twice a year suits most homes, with an extra rinse for road facing or coastal sides where grime and salt build up faster.