iGLASSBOT W120-DP
Limited evidenceRead the findings →Mamibot's newer square window robot, slim and cheap, with grip that adjusts itself. It suits upright windows between proper cleans and finds the frame well. It often leaves streaks and a greasy film, though.
See the alternatives below, or switch market.
Where it sits in Mamibot’s range
- iGLASSBOT W120-DPThis model
- iGLASSBOT W120-POlder square model with twin sprayers
- iGLASSBOT W100Budget round model with two spinning pads
- iGLASSBOT W168Round model with twin sprayers and an 80ml tank
- W200 SkyBotCordless model with no sprayer
- iGLASSBOT W300Flagship that sprays, wipes and squeegees in one pass
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What we know
heise online tested the W120-DP at home and found it easy to set up and surprisingly good at finding its way for a cheap robot, with four corner sensors that reliably found the frame and a fairly quiet motor. The cleaning was the let-down: it lifted coarse dirt but often left streaks and a greasy film, and heise would rather buy the Ecovacs WINBOT mini. Mamibot's claims about self-adjusting grip and self-cleaning belts weren't part of that test.
heise online, hands-on, Aug 2025
Streaks and smears left behind
heise online called the cleaning result sobering. The W120-DP removed coarse dirt, but often left streaks and a greasy film, and the tester says you'll need to go over the glass again. It's fine for light, everyday dirt, not a spring clean. Mamibot says its four nozzles spread the water evenly across the glass, but in this test that didn't add up to streak-free panes.
Finds the frame reliably
Navigation was the pleasant surprise. heise online found it worked remarkably well for a cheap device: it measures the width of the window first, then works across it in tidy lanes, and four ball sensors at the corners reliably picked up the frame. An extra sensor lets it clean frameless glass too, and Mamibot lists both framed and frameless upright windows as suitable.
Plugged in the whole time
The W120-DP only runs on mains power, so the cable has to stay connected the whole time, heise online notes. A backup battery keeps it on the glass if the power cuts out: heise online quotes up to 30 minutes, while Mamibot says up to 25. The tester had to charge it for 40 minutes before first use and tie the 5m safety rope to something solid. You'll need a socket near every window.
Fairly quiet, basic app
heise online describes its brushless motor as relatively quiet at 65dB(A). The app only covers the basics, and the voice prompts are in English. Mamibot says up to eight languages are possible, but they have to be set at the factory. You can also drive it with the supplied remote, choosing zigzag, lane or combined routes, or sending it up, down or sideways.
The independent test cited here is from heise online (Germany, August 2025).
Our take
Should you buy the iGLASSBOT W120-DP?
Best for: Large windows cleaned regularly, with a socket nearby. Skip it if: You expect a spotless finish after one run.
Buy it if you want a cheap square robot for upright windows, framed or frameless, and you'll accept a less-than-perfect finish between proper cleans. If you want clear glass after one run, heise's advice is to spend a little more on the Ecovacs WINBOT mini, which two German testers found mostly streak-free. If there's no socket near your windows, the Ecovacs WINBOT W2S OMNI runs from a battery station.
The W120-DP is Mamibot's newer square window cleaner, listed as a 2024 arrival. It's slim at 6.9cm and weighs 1.4kg. Two nozzles on each side spray water in the direction it's heading, from a 60ml tank Mamibot says covers about 20 square metres, and it adjusts its own grip to the glass. You run it from an app or a remote, choosing zigzag, up-and-down or combined routes. It's the step on from the older W120-P, which has fewer nozzles and no listed backup battery.
The trade-off is the finish. heise's home test found it navigated well for a cheap robot and was fairly quiet, but left visible streaks and a greasy film, so you may need to go over the glass again. It also has to stay plugged in the whole time, with a backup battery only for emergencies.
Before you buy
The questions people ask about this one
Will it work on frameless glass?
Yes, according to both sources. heise online says an extra sensor lets it clean frameless glass, and the specifications lists framed and frameless upright windows. It isn't meant for roof or ceiling glass, and Mamibot wants a tilt of more than 15 degrees.
What happens if the power cuts out?
A built-in backup battery keeps it attached and sounds an alert. the specifications says up to 25 minutes; heise online says up to 30. Otherwise it runs only from the mains, and it comes with a 5m safety rope to tie to something solid.
Does it leave streaks or edges?
Streaks, yes. heise online found it removed coarse dirt but often left streaks and a greasy film, so you'll probably have to go over the glass again. The corner sensors found the frame reliably, but the test doesn't say how close to the edges it cleaned.
Do I need a special cleaning fluid?
Neither source mentions a special fluid. heise online found a 60ml tank under a rubber flap, feeding four nozzles that spray water or cleaning liquid. the specifications says one tank covers about 20 square metres, and it warns you when it's running low.
How loud is it?
Less than you might fear. heise online describes its brushless motor as relatively quiet, at 65dB(A). the specifications also calls the motor quieter but gives no figure of its own. We haven't found a side-by-side noise test against other window robots.
Alternatives
Other window-cleaning robots to compare.
WINBOT MINI
Why consider it: heise's own pick over this robot, and two German home tests found it left glass mostly streak-free after one pass.
The compromise: It needs a socket nearby too, and one tester saw dirt left in the last millimetres at the frame.
WINBOT W2S OMNI
Why consider it: Its battery station means no socket by the window, and three recent tests found it cleans everyday dirt well.
The compromise: Corners still aren't perfect, and you move it between panes and rinse the pad yourself.
S7 Pro
Why consider it: TechRadar found it excellent on lightly dirty glass and spot on at detecting frameless edges.
The compromise: Both tests found streaks on dirtier glass, and it saves effort rather than time.
iGLASSBOT W120-DP head to head
Head to head
ECOVACS WINBOT MINI vs iGLASSBOT W120-DP
Our verdict: heise, which tested the W120-DP, says it would rather pay a little more for the WINBOT mini because it cleans better. Two German home tests of the mini found mostly streak-free glass after one pass, while the W120-DP left streaks and a greasy film. Both need a socket nearby.
Specs
Full specifications
Each specification names its source. Manufacturer claims are not independent test results; unconfirmed figures are labelled.
Owner reviews
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Sources
Where this page’s findings come from
Editorial reviews
Sources
- Mamibot: iGLASSBOT W120-DP product page ↗Manufacturer
Videos
- William Will: Mamibot iGLASSBOT W120-DP robot window cleaner Test for Cleaning Sticky Glue on glass ↗
- Search YouTube for Mamibot iGLASSBOT W120-DP ↗Search results may include company demonstrations or similar models. Check the source and model name; a demonstration is not an independent performance test.