Most businesses schedule window cleaning in spring and summer. It is easy to see why: longer days, milder weather, and the obvious visual appeal of clean glass in bright sunshine. But window cleaning in winter is not less important. In many ways, it is more important. And one specific reason stands out that most businesses have not considered.
Low winter sun sits at a much lower angle than summer sunlight. That means it hits your windows directly rather than from above, and at that angle, every smear, streak, mineral deposit, and grime build-up on the glass becomes visible in a way that higher summer sun never reveals. The windows you thought were clean in August look very different in November.
This guide covers why window cleaning in cold weather matters for commercial premises, how professional window cleaning works in winter, and what to look for in a contractor.
Why Does Low Winter Sun Make Window Cleaning More Important?
The sun rises lower in the sky from October through to February. At that angle, light travels through glass rather than reflecting off the top of it, making contaminants on the surface visible that higher-angle light would have missed entirely. Streaky windows in winter are not caused by more dirt; they’re caused by the same dirt being exposed differently. Hard water mineral deposits, condensation residue, pollution, and the film left by inadequate cleaning all become visible under low-angle winter light in a way that catches clients and visitors off guard.
For businesses with client-facing reception areas, meeting rooms, or retail frontages, the appearance of your windows in winter is a direct reflection of your standards. A building that looked presentable throughout summer can look neglected by November without anything having changed except the angle of the light.
Do Window Cleaners Work in Winter?
Yes. Professional commercial window cleaners operate year-round, and cleaning windows in winter is entirely routine.
The equipment and methods used by professional contractors are well-suited to cold weather conditions. Carter and Faraday’s water fed pole window cleaning system uses purified water delivered through a telescopic brush head to the glass surface. Because the water is purified, with all minerals and contaminants removed, it leaves glass completely spot-free and residue-free as it dries. There is no washing-up liquid, no squeegee, and no residue to freeze or streak.
This system works effectively in cold weather and is one of the reasons professional results in winter are consistently better than attempts at DIY cleaning windows in winter using tap water and household products. Tap water contains dissolved minerals that leave marks as the water dries, marks that low winter sun will show up immediately.
Window cleaning health and safety in winter does require additional consideration. Shorter daylight hours, potential ice on access surfaces, and colder conditions affect how and when cleaning visits are scheduled. Professional contractors manage this as part of their normal operating procedures. Carter and Faraday operatives are accredited by IOSH and work to rigorous safety standards regardless of season.
Can You Use a Water Fed Pole in Winter?
Yes, and it is one of the most effective methods for window cleaning in cold weather. The purified water used in a water fed pole window cleaning system does not contain the dissolved minerals that cause streaking. It flows over the glass, lifts contamination from the surface, and dries completely clear. Because no chemicals are added, there is no residue to freeze on the glass or surrounding frames.
For high level window cleaning on commercial premises up to 20 metres, water-fed pole systems also remove the need for ladders, scaffolding, or hydraulic platforms, a significant safety and logistical advantage in winter conditions when access equipment is harder to use safely.
Why Are My Windows Streaky?
Streaky windows are most commonly caused by one of three things: hard water stains on windows, inadequate cleaning technique, or cleaning products that leave residue on the glass.
Hard water stains on windows occur when tap water containing dissolved calcium and magnesium evaporates on the glass surface, leaving mineral deposits behind. In areas with hard water, which includes much of Sussex and Surrey, this is a persistent problem that worsens with repeated cleaning using tap water. Every clean deposits another layer of minerals.
Professional water fed pole window cleaning with purified water eliminates this cycle. The purified water contains no dissolved minerals, so it cannot leave deposits. Hard water staining already on the glass requires specialist treatment to remove. Carter and Faraday offer hard water stain and mineral deposit removal as part of their commercial window cleaning services.
Low winter sun makes existing hard water stains on windows considerably more visible. If your windows look streaky and dirty in sunlight despite being cleaned recently, mineral deposits are almost certainly the cause.
How Often Should Commercial Windows Be Cleaned in Winter?
The general guidance on commercial window cleaning frequency is covered on the Carter and Faraday window cleaning service page. For winter specifically, a few additional factors apply.
Shorter daylight hours mean there are fewer usable hours for outdoor window cleaning each day. Scheduling in advance, rather than booking reactively when windows are already visibly dirty, ensures visits happen at the right intervals and are not delayed by limited availability during the busiest part of the season.
Condensation increases in winter as the temperature difference between inside and outside air rises. Condensation on cold glass attracts particulate contamination from the air, which settles and dries on the surface. Buildings with high internal humidity, commercial kitchens, gyms, swimming pools, and healthcare facilities accumulate window contamination faster in winter and may require more frequent visits than in summer.
Carter and Faraday offer flexible scheduling including out of hours cleaning, early mornings, evenings and weekends, to minimise disruption to operations and to make use of available daylight outside of peak business hours.
Natural Light in the Workplace: Why It Matters More in Winter
Winter reduces the hours of natural daylight available to staff significantly. A workplace that receives good natural light in June may feel noticeably dark by December, and dirty or film-covered windows make this worse.
According to industry research, access to natural light in the workplace is consistently linked to improved mood, reduced fatigue, and better concentration among staff. In winter, when daylight is already limited, maximising the light that does come through windows becomes more important. A dark office in January is not just an aesthetic problem; it affects how staff feel and how productive they are.
Clean, professionally maintained glass transmits considerably more light than glass coated with mineral deposits, pollution film, and condensation residue. Regular window cleaning in winter is one of the simplest ways to maintain the quality of natural light in the workplace during the months when it matters most.
Commercial Window Cleaning in Winter Across Sussex and Surrey
Carter and Faraday provides professional window cleaning in winter and year-round commercial window cleaning services across East Sussex, West Sussex, and Surrey, including Brighton, Crawley, Haywards Heath, Horsham, Guildford, and the surrounding areas.
Our services include interior and exterior window cleaning, high level window cleaning up to 20 metres, purified water fed pole window cleaning, hard water stain removal, and flexible out of hours cleaning to suit your operations.
We are proud members of the Federation of Master Window Cleaners, and all operatives are accredited by IOSH.
To arrange a free site survey or discuss a regular window cleaning contract, call us on 01444 482 666 or email sales@carterandfaraday.co.uk.
