Never heard of such a thing but it doesn't seem like much of an effort/time saver to me. You would still have to move it from one window to the next. Maybe if you lived in a mansion with some humongous windows but then you would probably be hiring a window cleaner to do the job periodically.

I can wash the 20 or so windows on my ranch house in about 3 hours.

I meant to ask the same question after seeing one advertised, along with the same type of thing to clean bbqs/grills. I’m not sure how it would work on certain windows, such as ours with wood grilles. Do they move over the grilles and get into corners?

This from AI…

Yes, robotic window cleaners work well for routine maintenance, light dust, and fingerprints on large, flat glass, but they have distinct limits. High-end models like the Ecovacs Winbot use strong suction and smart navigation to safely clean high-rise or hard-to-reach exterior windows without ladders. However, they struggle with heavy grime, caked-on dirt, tight corners, and window frames.

Benefits and Pros

• Safety: Keeps you off dangerous ladders when cleaning upper-level or high-rise exterior glass.
• Ease for Large Panes: Great for big sliding doors, large windows, and large mirrors.
• Hands-off Routine Care: Excellent for regular upkeep so dirt does not build up. YouTube·Tech It Before You Wreck It +1

Limitations and Cons

• Not for Deep Cleaning: Caked-on mud, heavy bird droppings, or old mineral/hard water stains need manual scrubbing.
• Edges and Corners: Most units cannot reach 100% of the extreme edges or sharp corners, leaving tiny spots to wipe by hand.
• Not Fully Automatic: You must manually place the robot on a window, plug it in, attach safety tethers, change the pads, and move it to the next pane.

The first review that I read said:

You will spend the entire 20-minute cleaning cycle staring outside like a nervous cat, wondering if the 8,000Pa suction is a lifestyle choice it will suddenly regret.

I clean my windows using a telephone. It's less work than using a robot.

There’s an app for everything!

I do what Elmer does. Works like a charm.

LOL, I’ll just keep the window cleaning service we’ve been using.👍🏻

With forty windows, I could use this. I can live with dust but hate dirty windows.

I haven't cleaned the windows on my house in 21+ years.

I like Elmer’s method, too. We have 8-over-8 double-hungs with self-storing storms. That robot would be as hard to manage as washing them myself.

I'm with LoneJack -- I do mine myself, one-story house. Super-fast inside and out once you've got a good technique down and have the right tools. It would take me longer to fiddle with a machine than just do it manually.

Five storey town house, 11 eight over eight or six over six wooden sash windows with balconettes. I don't see a robot in my windows' future. Impossible to clean myself and working from a ladder at height is illegal here so our old window cleaner retired. The guys with brushes on long poles can't do them because of the balconettes. Result: dirty windows except for the ground floor which we can reach.

" I haven't cleaned the windows on my house in 21+ years. "

Does that mean you have to open a door to see what the weather is like outside?

;-)

I just call my window washer people. Plus, I don't have to store the robot in between uses.

That AI summary didn't mention apartment buildings, where I think there's a potential market for these things........most buildings never wash windows as often as they should. And they're far cheaper than window washing people (except yourself) - though they're obviously not right for every home and window configuration.