Cheap Squeegee, Costly Lessons: The Honest Maths of DIY Window Cleaning

There's a certain satisfaction to cleaning your own windows. You fill a bucket, dig out the squeegee from the back of the cupboard, and for twenty minutes you feel like you've got your life together. Then the sun comes out, hits the glass at an angle, and you can see every streak, every missed corner and every little bit of fluff you've just smeared across the pane.

I'm not here to tell you never to pick up a squeegee. Plenty of people do a perfectly decent job on their ground-floor windows, and there's nothing wrong with that. But there's a conversation worth having about what DIY window cleaning actually costs — not just in pound coins, but in time, effort and the odd moment of genuine risk. As a local cleaner, I've seen both sides of this, and the honest answer is more interesting than 'always call a pro'.

The appeal of the Sunday bucket

It's easy to see why DIY appeals. A basic squeegee, a bucket and a bottle of washing-up liquid costs less than a takeaway. You can do it in your pyjamas. You don't have to book anything or be in when someone turns up. And for a lot of UK homes, especially bungalows and ground-floor flats, a quick going-over is genuinely fine between proper cleans.

The trouble starts when 'quick going-over' becomes the only plan. Windows are exposed to everything the British weather can throw at them — rain, traffic film, pollen, bird mess, salt from the roads in winter and hard water from the tap. A quick wipe with a soapy cloth doesn't always remove that; sometimes it just moves it around and leaves a film that attracts more dirt.

What DIY actually costs

Let's do the maths honestly. A squeegee, scrubber, bucket and decent cloths might set you back £30 to £60 if you buy them new. That's not much. But then you add your time. Cleaning the outside of an average UK house properly — upstairs windows included — takes longer than people think. If you're doing it carefully, safely and without leaving streaks, you're probably looking at an hour or more. Do that every few weeks and the 'cheap' option starts to look like a part-time job.

There's also the kit that doesn't work. The squeegee that leaves a line down the middle. The ladder that's been in the shed since 2019. The cloths that leave lint. The extension pole that wobbles. People often end up buying two or three cheap versions before admitting that the good one would have been cheaper.

The UK weather problem

Window cleaning is a weather-dependent job in this country, and that's not just small talk. If you clean a window and it immediately rains, you've wasted your time. If you clean in direct sun, the water dries too quickly and leaves spots. If you clean in a cold snap, the water can freeze on the glass or make the frames slippery. The professionals build their week around the forecast; most of us don't have that luxury. We clean when we've got a spare hour, which is often the worst possible time for the job.

Hard water and the film you can't see

This is the big one in much of the UK. Tap water contains minerals, and when it dries on glass it leaves a fine white film. You might not notice it straight away, but over time it builds up and makes the glass look dull. Washing-up liquid can make it worse by leaving a residue that grabs dust. Professional cleaners often use purified water, which dries without those mineral deposits. That's not a magic trick; it's just a different method and a different kit. You can buy DIY pure-water systems, but by the time you've paid for the kit and the filters, the economics change.

Safety at height

This is the part where I stop being polite. Cleaning upstairs windows from a ladder is one of those jobs that looks easy until it isn't. Ladders slip. Gutters give way. People lean out of windows further than they should. Every year, decent, sensible people end up in hospital because they tried to save a few quid on a job that involves height, water and slippery surfaces. If your windows are above ground level, especially on a Victorian terrace or a house with awkward access, the safest DIY option is often not to DIY at all. A professional should have the right equipment — poles, water-fed systems, insurance — and the sense to know when a job isn't safe.

What a professional actually brings

A good local window cleaner isn't just selling you a shiny pane. They're selling consistency, insurance, the right kit and the ability to spot problems early. A trained eye notices a cracked seal, a blocked drainage slot or a bit of render that's come loose. They can clean windows that are awkward to reach without hanging off a ladder. And they turn up, which sounds like a low bar, but reliability is worth something when you've got a busy week.

That said, not every professional is brilliant. Ask around, check reviews, and be wary of anyone who quotes suspiciously cheap and won't explain what they'll do. A fair price for a proper job is not the same as the cheapest price.

When DIY is genuinely fine

I'll say it plainly: if you live in a bungalow, have easy ground-floor access, and you're happy with a quick maintenance clean between professional visits, DIY is a reasonable choice. It's also fine for shed windows, conservatory roofs you can safely reach from inside, and the odd patio door. The problems come when DIY is doing a job it isn't suited to — upstairs glass, hard-water areas, large panes, or anything that needs a ladder and a bit of bravery.

The honest conclusion

Streaky windows are not a disaster. But they're a false economy if they're the result of hours of your time, a ladder you shouldn't be on, and a kit that never quite works. The real cost of DIY isn't the bucket; it's the time, the re-dos and the risk.

If you enjoy cleaning your windows and you can do it safely, carry on. If you've read this and quietly nodded at the bit about ladders, hard water and streaks, that's probably your answer. A local professional isn't the right call for every home, but for a lot of UK houses it's cheaper than it looks — and a lot safer than a Sunday afternoon on a wobbly ladder.