How to care for uPVC windows and doors

Use a simple seasonal routine

A thorough clean in spring and autumn is a useful starting point, with quicker checks after building work, decorating or severe weather. The aim is not to dismantle anything. Remove ordinary dirt, make sure water can drain away and notice whether moving parts feel different from the previous check.

Work around the property methodically and include windows that are rarely opened. A spare bedroom window can develop a stiff handle or blocked drainage route without being noticed. Keep the product-care information supplied at installation, because materials and hardware can vary between systems.

• Frames and glass
• Drainage openings and door thresholds
• Handles, hinges and locking points
• Rubber gaskets and perimeter seals
• Tracks, restrictors and trickle vents

Clean frames without damaging the finish

First lift off loose grit with a soft brush or cloth so it is not rubbed across the surface. Wash uPVC frames with warm water and a small amount of mild household detergent, then wipe away residue. Use a soft cloth or non-abrasive sponge and pay attention to the lower frame, where dirt often collects.

Avoid scouring pads, cream abrasives, bleach, solvents and improvised chemical mixtures. They can dull the surface, mark decorative foils or affect nearby seals. Coloured and woodgrain finishes deserve particular care. Test any unfamiliar product on an inconspicuous area and follow the frame manufacturer's instructions when dealing with a stubborn mark.

Clean glass and recognise failed units

Use clean water or a suitable non-abrasive glass cleaner with a soft, lint-free cloth. Remove grit before polishing and avoid metal scrapers. Decorative glass, applied bars and lead effects may have their own care instructions, so treat them more gently than an undecorated pane.

Condensation on the room side or weather side of the glass is different from misting inside the sealed unit. Surface moisture can be wiped away and should prompt a wider look at temperature, humidity and ventilation. Moisture trapped between the panes cannot be reached by cleaning and may indicate that the sealed unit needs professional assessment.

A small scratch, edge chip or crack should not be ignored. Do not press the area or attempt a household repair. Keep people away from damaged glazing and ask a competent company to advise on safe replacement, particularly for glass in or beside a door.

Keep drainage, tracks and thresholds clear

Modern frames manage rainwater through designed channels and drainage openings. Vacuum or brush away leaves, grit and insect debris from accessible channels and door thresholds. Wipe visible drainage slots, but do not enlarge them or push a sharp object deep inside the profile.

Sliding and folding door tracks deserve frequent attention because grit can obstruct rollers and scratch the surface. Lift debris out rather than washing large quantities of water into the track. Check that external paving, mats and leaves are not covering drainage outlets around a low threshold.

Water appearing after extreme wind-driven rain does not automatically identify the cause. Record where and when it appears, take photographs and check that visible routes are clear. Repeated ingress needs investigation. Adding sealant over drainage slots can trap water and make the fault harder to diagnose.

Operate and inspect the hardware

Open each product gently and run handles through their normal sequence. A sash or door should be fully in the correct position before the handle is moved. If something catches, lift or close it normally and try again once. Repeated force can damage a gearbox, keeps or hinges when the underlying problem is alignment.

Look for early changes such as a door rubbing the threshold, a handle needing more pressure, loose visible screws or a window that no longer stays where expected. Seasonal temperature changes can alter how a large door feels, but a persistent or worsening change should be checked before it prevents locking.

Lubrication requirements differ. A manufacturer may recommend a light application to particular locking points while advising a different product, or none at all, for cylinders, friction stays and gaskets. Use only the specified lubricant in the stated locations, wipe away excess and never loosen adjustment screws unless you know their purpose.

• Never force a stiff handle
• Do not hang items from handles or openers
• Keep keys available but out of children's reach
• Stop using damaged restrictors
• Arrange adjustment before rubbing becomes severe

Inspect seals, vents and perimeter finishes

Rubber gaskets should sit evenly in their grooves and remain clean and flexible. Wipe them with a damp cloth, but do not stretch, cut or glue a loose section. Paint and chemical cleaner can affect the seal. A gasket that repeatedly works free may need correct refitting or replacement.

Keep trickle ventilators free from dust and make sure their controls move without being forced. They form part of the home's planned background ventilation, so permanently taping or filling them can reduce airflow. During routine cleaning, record cracked perimeter sealant, loose trims or staining and avoid merely covering the symptom.

Know what needs professional attention

Request help if a door or window will not lock normally, glass is cracked, a sealed unit is misted internally, a restrictor is damaged or water repeatedly enters around the opening. Also report a sash that has dropped, a hinge that appears loose or a door that needs lifting to engage the lock.

Describe the exact product, room and symptom, and include photographs or a short video if useful. Keep the quotation, final schedule and guarantee documents together so the product can be identified. Avoid dismantling locks or glazing beads while a fault is being assessed, as this can create a safety risk and complicate diagnosis.