Quick answer: In a flat or high-rise, the safe options are: clean any openable/tilt-in windows from inside; use a robot window cleaner on balcony glass and any exterior pane you can reach to place it on; use a magnetic cleaner only if your glazing is thin enough; and rely on building management's scheduled façade cleaning for fully sealed panes. Never lean out of a window or climb onto ledges — no view is worth it, and your lease almost certainly prohibits it anyway.
You pay extra for the view. The skyline, the sunsets, the smug feeling in the lift.
What the listing photos never showed: the outside of that view, slowly accumulating a city's worth of rain spots, traffic film and pigeon opinions — on glass you are physically, legally and sensibly unable to reach.
So every golden hour now comes with a soft-focus grime filter you didn't order. Let's fix what can be fixed, and be honest about what can't.
Rule zero: nothing that puts your body outside the building
No leaning out with a squeegee arm. No standing on window sills. No "it's fine, I'll hold the frame." Falls from height are the most lethal category of domestic accident there is, and most leases and building rules explicitly ban residents from exterior cleaning — for exactly this reason. Every method below keeps you fully indoors or on your own balcony.
Option 1: Tilt-in and openable windows — clean them from inside
If your windows tilt inward (common in EU builds) or open fully, the outside face can come to you. Tilt, clean the exterior face from indoors, done. Tedious with a cloth, quick with a spray-and-squeegee.
Even quicker: attach a robot to the outer face while it's tilted or on panes adjacent to an openable one. Which brings us to—
Option 2: A robot window cleaner — the flat-dweller's cheat code
Here's the insight that changes the game for apartments: *a robot doesn't need you to reach the whole pane. It only needs you to reach enough glass to place it.*
Put the CleanBot R1 on your balcony glass, your floor-to-ceiling interior faces, or any exterior pane accessible from a balcony or opening window, and it takes over: 6,500Pa of suction keeps it locked to the glass, a fine water mist and systematic N/Z passes do the actual cleaning, and an 8-layer safety system — including a secured tether you anchor indoors and a backup battery that keeps it gripping through a power cut — covers the what-ifs.
For high-rise residents this is the difference between "that pane is uncleanable" and "that pane takes 4 minutes." It's exactly the use case reviewers now recommend robots for: apartment glass that no ladder, pole or human arm can otherwise serve.
And the inside of big glass walls — which fog with cooking film and fingerprints faster than any other window in the home — becomes a press-a-button job instead of a stretch-and-wobble session.
Option 3: Magnetic cleaner — only if your glass is thin
The two-sided magnet trick works through single glazing and some slim double glazing. Modern high-rise curtain-wall glass is usually far too thick. Full honest comparison here — check your glass spec before spending.
Option 4: The building's façade cleaning (know your rights)
Sealed, non-openable panes above reachable height are the building's job, not yours. Most managed blocks schedule external cleaning 1–4 times a year — it's typically buried in your service charge. If your windows are filthy and you can't remember the last abseiler, email the management company and ask for the cleaning schedule. You're paying for it; use it.
The realistic apartment strategy
| Glass | Your move |
|---|---|
| Interior faces (all of them) | Robot — weekly/fortnightly, zero effort |
| Balcony glass, both sides | Robot |
| Tilt-in or openable exterior faces | Tilt + clean, or robot on the reachable face |
| Thin-glazed sealed panes | Magnetic cleaner (check thickness) |
| Sealed panes, thick glass | Building management — chase the schedule |
That combination typically takes an apartment from "80% of my glass is uncleanable" to "one pane is the building's problem."
FAQ
How do you clean the outside of windows in a high-rise apartment?
Clean openable/tilt-in windows from inside, use a robot window cleaner on balcony glass and reachable exterior panes, and rely on building management's scheduled façade cleaning for sealed panes. Never lean out or climb.
Can I use a robot window cleaner in an apartment?
Yes — flats are their ideal habitat. You place the robot on any reachable glass (interior faces, balcony panels, tilt-in exteriors) and it cleans the full pane automatically with suction grip and a safety tether.
Who is responsible for cleaning outside windows in a flat?
For sealed panes beyond safe reach, usually the freeholder or management company via scheduled external cleaning, funded through your service charge. Check your lease and ask for the cleaning schedule.
Is it safe to lean out of a window to clean it?
No. Falls from height are among the most lethal domestic accidents, and most leases prohibit residents from exterior cleaning. Use tools that keep you fully inside.
Unlock the panes you'd written off: CleanBot R1 — £173, 8-layer safety, 24-month warranty, free UK delivery over £75.