Autumn window cleaning works best when it is planned before the first frosty mornings. I look for a dry, calm day somewhere around 5 to 15°C. That range is not a law; it is useful breathing room. Water stays liquid, your hands still work properly, and the cleaning solution does not flash-dry on the pane. If the forecast is heading towards zero, strong wind or rain within a few hours, postpone the job.
Why the last autumn clean needs its own plan
Spring windows are usually about pollen. Summer brings hot glass and solution that dries before the squeegee reaches it. By autumn, panes and frames carry a mixture of both seasons: pollen tucked into corners, city dust, marks left by rain, and a slightly greasy film indoors. Once the heating comes on, fine household dust starts gathering near radiators and window sills too.
Daylight is the awkward part. In October, starting at four in the afternoon and expecting to finish six windows, frames, blinds and sills is optimistic. Cold glass dries more slowly, damp cloths become unpleasant to handle, and low sun often reveals streaks just as you are putting the bucket away. Window cleaning before winter is maintenance of the whole window area, not a quick polish of the glass.
I learned that in a Vršovice flat with three tall double casement windows. They looked like a two-hour job. Each one had inner and outer leaves, dusty blinds between them, and deep frames that had not been washed for years. By half past four, the edges were too dark to inspect properly. The final pane had to be done again the next morning. Since then, I budget daylight as carefully as the number of windows.
Choose the day by temperature, sun and forecast
A dry, overcast morning is usually ideal. Start on the shaded side of the building and follow the shade if you can. Direct autumn sun feels welcome, but it can still heat one pane enough to dry the solution unevenly. The result is extra polishing rather than faster work.
For anyone searching for the best temperature to clean windows, a practical target is roughly 5 to 15°C. Below 5°C, continue only if the glass is dry, the air is calm and the temperature is not falling towards freezing. At 0°C or below, leave it. Water can freeze on glass, hardware and an outside sill, while balconies and steps become slippery. Cleaning products may also behave differently in cold conditions, so check their labels.
Air temperature does not tell you everything. A north-facing pane may still be very cold after a clear night even when a balcony thermometer reads 6°C. Touch a lower corner with the back of your hand. If the glass feels strikingly cold or carries frost, wait. Do not compensate with hot water. Lukewarm water is comfortable to handle and avoids putting a sudden temperature difference across cold glass.
Wind deserves its own check. It chills wet hands, blows dirt back onto the pane and can slam an open casement against its frame. The forecast for Prague may look calm while the tenth floor of your building is anything but. Look at the trees from the actual window, then check sunset time. Aim to finish the last pane at least half an hour before dusk so you can inspect it in natural light.
Split a larger flat over two mornings if necessary. Street-facing windows can be Saturday's job and courtyard windows Sunday's. Autumn weather is not worth fighting. Two short, calm sessions beat ending a long day on a step ladder in poor light.
The order that prevents streaks and repeat work
Starting with the glass is the usual mistake. Dust from a blind or the top edge of a frame lands on the clean pane, then dirty water from the channels runs across the sill. Use this order instead:
- Move plants, curtains and furniture, then protect the floor with an old towel.
- Remove dry dust from blinds, screens and the top of the frame.
- Wash frames, channels, handles and sills.
- Wet and squeegee the glass.
- Dry the lower edge and corners, then check the floor.
Keep separate tools for dirty frames and glass. A sponge that has just lifted black grime from a channel will leave a grey film on the pane. I use colour as a reminder: an older grey cloth for frames, a clean pale microfibre cloth for glass edges, and one dry cloth reserved for inspection. Wipe the squeegee blade after every pass. It is a small habit, but it prevents those long, irritating lines.
On a heavily dusty window, make the first wash with clean water to remove grit. Use a small amount of cleaner on the second pass. More detergent does not produce cleaner glass; residue leaves a film that low autumn sun exposes without mercy. For a closer look at squeegee technique, our guide to streak-free window cleaning in summer heat covers the hand movements. In autumn, the temperature problem is simply reversed.
Inspect each pane from two positions while there is still daylight. If the window design allows it, finish the inside with horizontal movements and the outside vertically. The direction of any remaining line tells you which side needs another wipe. Waiting until evening under a ceiling light makes the job harder.
Check frames, drainage and seals before winter
Autumn is a good time to look closely at the lower frame. Many uPVC windows have small drainage openings that let water escape. Vacuum loose dirt with a narrow attachment or ease it out with a soft brush and damp cloth. Do not poke the opening with a knife, screwdriver or wire. That can scratch the profile or push debris further inside.
Wipe seals gently with water and a product approved by the window maker, then dry them. Aggressive degreaser and abrasive paste do not belong here. While cleaning, look for rubber that is cracked, permanently hard or pulled out of its channel. Cleaning will not repair it. Nor will it fix a casement that scrapes the frame, a handle that needs force, or a closed window that still lets in a noticeable draught.
Condensation on the room side after cooking or showering does not automatically mean a failed seal. Wipe it away, ventilate briefly and watch whether it returns at normal indoor humidity. Call for inspection if moisture sits between the panes of an insulated glass unit, wet patches appear around the frame after rain, or mould keeps returning beside the reveal. Those are jobs for a window technician, building manager or defect specialist, not a stronger spray.
Wooden frames need an extra look. Peeling paint, opening joints or soft timber should be dealt with before several months of rain and frost. Clean with a lightly damp cloth, dry the surface promptly and follow the coating or window manufacturer's care instructions.
When professional window cleaning is worth it
The real test is not whether you can use a squeegee. Ask whether you can reach every surface with both feet on a solid floor or on suitable, stable steps. If the plan involves standing on a sill, leaning out, moving a ladder around a balcony or holding a heavy open casement with one hand, stop. Height and awkward access are enough reason to book professional window cleaning.
The same applies to large sliding walls, conservatories, roof windows and glazed balconies whose outer face cannot be opened safely inwards. A professional should be able to explain the access method and equipment before the visit. The word "professional" on its own is not a safety method.
Before requesting a quote, count more than “eight windows”. A modern two-leaf window is a different job from a traditional Prague casement with four glass surfaces, blinds and a deep sill. Note for each room:
- the number of windows and opening leaves;
- whether the job includes both sides of the glass, frames, sills, blinds and screens;
- approximate height and opening method;
- stubborn contamination such as adhesive, paint specks or bird droppings;
- access to water, parking and any restrictions in shared areas.
Add two or three photos. For tall glazing, photograph the floor space and access route as well as the glass. The cleaner can then estimate time, staff and equipment more realistically. It also prevents a quote for “glass only” when you expected frames, blinds and drainage channels.
For a normal, easy-to-reach double window with moderately dirty frames and sill, allow roughly 30 to 45 minutes as a household estimate. Blinds, double casements and neglected channels can add a lot. Five windows may take most of a day, not a casual two-hour slot, especially once you include setup and clearing away.
If access is safe, the forecast is stable and you have an unhurried half day, autumn window cleaning is a reasonable DIY job. Once height, extensive glazing, strong wind or uncertainty enters the plan, paying for help is not indulgent. It is sensible risk management.
If you need a Prague-based option before winter, send a no-obligation request through the ČistýKout contact form. Include the number of opening leaves, blinds, outside access and a few photos. A clear brief makes it far easier to quote for the whole job rather than an undefined “window clean”.
