Best Window Cleaning Robot 2026: The 6 Models Worth Knowing

In 2026, the most complete window cleaning robot is the Ecovacs Winbot W2 Omni (or its successor, the W2S Omni), thanks to a battery station that frees you from the wall socket and a safety cable that winds itself away. On a tighter budget, the Cecotec Conga WinDroid 1090 Double Spray Connected brings dual spraying and a hold-on battery, while the Hobot 2S remains the compact go-to for frameless glass with its ultrasonic nozzles.

A window robot won’t completely replace cleaning by hand: it shines on large patio doors, conservatories and hard-to-reach windows, but it needs a little preparation and proper safety precautions, especially on the outside. This comparison is based on manufacturer specifications, reviews published by specialist media and verified buyer feedback. You’ll find the full selection in our window cleaning robots section.

How to choose a window cleaning robot: the criteria that matter

Suction or magnets: two very different technologies

Almost every current robot stays on the glass through suction: a motor creates a vacuum underneath, pressing the unit against the pane while it moves over one side. Models in this comparison often quote suction of around 2,800 Pa. The upside: they work on single or double glazing whatever its thickness, and also clean mirrors and smooth tiles.

Magnetic systems come in two parts, one inside and one outside, held together through the glass by magnets. They clean both sides at once, but the glazing thickness must match the magnet strength, so thick double or triple glazing may be incompatible. They remain niche and mostly manual; for an autonomous robot, suction is the standard.

Safety rope and backup battery (UPS)

A suction robot depends on its power supply: if the power cuts out, it can come off the glass. Two safeguards are essential. First, the safety rope, tied to a fixed point indoors, which catches the unit if it falls. Second, the backup battery (often called a UPS) that keeps the suction running for several minutes after a power cut, giving you time to retrieve the robot. Manufacturers quote, for example, up to 20 minutes on the Hobot 2S and Mamibot W120-T, and around 30 minutes on the Cecotec WinDroid 1090.

Automatic spraying

A robot without spraying works with a pad you dampen by hand, which dries quickly and leaves streaks on large surfaces. Recent models include a small tank and one or more nozzles: ultrasonic nozzles that create a very fine mist (Hobot 2S), bidirectional cross spraying (Winbot W1 Pro), three-nozzle wide-angle spraying (Winbot W2 Omni) or double spray (Cecotec 1090). Only use water or the product recommended by the manufacturer so the nozzles don’t clog.

Frameless glass and edge detection

On a standard window, the robot detects the frame by bumping into it. On a shower screen, a glass balustrade or a frameless pane, it has to sense the edge with a sensor: the Winbot W1 Pro, W2 Omni and Hobot 2S all claim edge detection that works on frameless glass. Without it, the robot can reach the edge, lose suction and fall.

Square or round

Square robots, on tracks or wheels, follow a Z or N path and reach corners better: that is the format of every model here. Round or oval robots with two rotating discs “walk” on their pads; they cope well with uneven surfaces but more easily leave a corner untouched. For standard windows, square is the most versatile choice.

Minimum pane size and runtime

A robot needs room to manoeuvre: allow a minimum of about 40 × 40 cm for the Hobot 2S, and roughly 30 × 30 cm for the Winbot W2 Omni according to published reviews. Small Georgian-style panes are still a job for manual cleaning.

The 6 window cleaning robots worth knowing in 2026

1. Ecovacs Winbot W2 Omni: the most complete

The Winbot W2 Omni stands out with its portable station: it holds a high-capacity battery that powers the robot while it cleans, so you don’t have to hunt for a socket next to every window. The safety and power cable are combined into a single cord of about 5.5 m, wound in automatically by the station. On the cleaning side: a claimed 2,800 Pa of suction, three-nozzle wide-angle spraying, WIN-SLAM 4.0 path planning and edge detection for frameless glass, all controlled from the ECOVACS HOME app.

Drawbacks: it’s a premium model, the station is bulky and published reviews note that the pads get dirty quickly on very grimy glass.
Best for: homes with several large glazed doors or a conservatory.

2. Ecovacs Winbot W2S Omni: the successor with cleaner edges

Launched in Europe in 2025, the Winbot W2S Omni keeps the station concept of the W2 Omni and adds TrueEdge technology: small scrubbers on the outer wheels lower when they reach the edges, then retract, to clean better along the seals. It runs on battery or mains power, and its station attaches with suction cups and retracts the cable automatically.

Drawbacks: priced even higher than the W2 Omni; how much TrueEdge helps depends on the state of your seals.
Best for: anyone who wants the latest Ecovacs model and spotless edges.

3. Hobot 2S: the compact ultrasonic option

The Hobot 2S is a square 24 × 24 cm robot weighing about 1.3 kg, fitted with two ultrasonic nozzles that spray a very fine mist. Its 4.5 m safety rope is rated for 200 kg of pulling force, and its backup battery keeps it in place for up to 20 minutes after a power cut. An air-leakage sensor detects the edges of frameless glass. The manufacturer quotes about 2.4 minutes per square metre.

Drawbacks: it must stay plugged in while cleaning and needs a pane of at least 40 × 40 cm.
Best for: shower screens, balustrades and frameless glazing, and anyone wanting a light robot.

4. Ecovacs Winbot W1 Pro: the safe bet

Older than the W2 range, the Winbot W1 Pro is still a benchmark: a claimed 2,800 Pa of suction, bidirectional cross spraying with a 60 ml tank, a fast edge sensor for frameless windows, a safety tether and power-cut protection. It doesn’t have the battery station of the Omni models.

Drawbacks: must be plugged into the mains, and you manage the cable yourself.
Best for: anyone who wants Ecovacs technology without the station.

5. Cecotec Conga WinDroid 1090 Double Spray Connected: best value

Cecotec’s Conga WinDroid 1090 Double Spray Connected sprays on both sides with its double spray, offers 8 cleaning modes (dry or wet) and can be controlled by app or remote. Its tank holds about 75 ml, it comes with a safety cord and its roughly 30-minute battery keeps it on the glass during a power cut. The cord gives a reach of about 7.5 m.

Drawbacks: build quality and navigation are less polished than Ecovacs according to buyer reviews.
Best for: a first window robot with spraying on a sensible budget.

6. Mamibot W120-T: simple and proven

The Mamibot W120-T keeps things simple: 1.35 kg, a claimed 2,800 Pa of suction, Z and N cleaning paths, a gyroscope to return to its starting point, and control by app, remote or on the unit itself. Its UPS battery provides up to 20 minutes of hold after a power cut and the robot alerts you to the problem.

Drawbacks: no automatic spraying advertised, older model.
Best for: occasional use on standard windows.

Comparison table

Cleaning the outside of windows: how to do it safely

A suction robot only cleans one side at a time. For the outside, you place it on the outer face with the window open or ajar, then close the window onto the rope if the model allows it. A few rules:

• Always tie the rope to a solid fixed point indoors, never to the handle of a window that could open.
• Never leave the robot unattended at height, and keep children and pets away from the area below the window.
• Avoid rain, strong wind and frost: moisture and cold affect grip and electronics.
• Dust off very dirty glass first (pollen, cobwebs), otherwise the pad will be saturated within minutes.
• Don’t use the robot on cracked glass, frosted or textured glass, or on a pane that’s too small.

Mistakes to avoid

• Buying without a backup battery: without a UPS, a power cut or a pulled cable is enough to make the robot fall.
• Ignoring the minimum size: on small panes the robot goes round in circles and wastes time.
• Putting ordinary glass cleaner in the tank: some products clog the nozzles. Follow the manufacturer’s instructions.
• Reusing a dirty pad: change it as soon as it turns grey, or the robot just spreads the dirt. Keep several washable pads.
• Expecting the robot to clean frames: it washes the glass, not the seals or runners.

The manual alternative: a Kärcher window vac

If your windows are small or split into many panes, a cordless window vac such as the Kärcher WV 6 Plus can be more efficient: you spray, wipe, then the squeegee sucks up the dirty water without drips. Kärcher quotes about 100 minutes of runtime with a remaining-time display. It needs you there, but it also handles mirrors, tiles and shower screens, and makes an ideal partner to a robot for finishing touches. For floors, see our steam cleaner guide.

Our verdict

For most households with large glazed areas, the Ecovacs Winbot W2 Omni is the most convenient choice: battery station, self-winding cable and effective spraying. The W2S Omni is worth it if you want perfectly clean edges. The Cecotec Conga WinDroid 1090 is the most reasonable entry point with double spray and a hold-on battery, and the Hobot 2S remains the frameless-glass specialist. Whatever the model, a tied rope and supervision are a must at height. To automate your floors as well, check our robot vacuum and mop comparison.