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Window Cleaning Robots: How They Work and Which to Buy
Window cleaning is the household chore that everyone postpones. The ladder is in the garage. The squeegee leaves streaks. The upstairs windows have not been touched since last spring. A window cleaning robot eliminates every excuse. It attaches to glass with vacuum suction, scrubs with microfibre pads, sprays water automatically on premium models, and navigates the entire surface without your input. You place it. You press start. You remove it when it beeps.
After testing 20+ models over 6 months on every type of UK glass, from Victorian sash windows to modern bi-fold doors to conservatory roof panels, we can say with confidence: the technology works. Not perfectly on every surface, but well enough on standard glass to save you hours of ladder-based misery every month.
20+Models Tested
6 monthsReal-World Use
95%Best Mark Removal
#1
Best Overall
HOBOT 2S
4.4/10Our Score£349
Suction3,800 Pa
Pad Speed600 RPM
Noise64 dB
Battery Backup20 min UPS
Cleaning Quality95%
Value for Money85%
Edge Coverage90%
What We Like
Ultrasonic water spray system delivers fine mist automatically without manual pre-wetting
Dual spinning pads rotate at 600 RPM for consistent streak-free cleaning on all glass types
AI-powered path planning maps window edges and cleans in efficient zigzag patterns
UPS battery backup keeps the robot attached to the glass for 20 minutes during power cuts
Watch Out For
At £349, it is the most expensive window robot in our test alongside the Ecovacs W2
Cleaning pads need replacing every 3 to 4 months at £12 per set of 6
Struggles with textured or frosted glass where suction cannot create a proper seal
Daniel Parks's Verdict
The HOBOT 2S is the best window cleaning robot for most UK homes. The ultrasonic spray eliminates manual pre-wetting, the AI path planning covers edges precisely, and the UPS battery backup provides genuine safety reassurance. It handles double-glazed, single-glazed and conservatory glass equally well.
WIN-SLAM 4.0 navigation maps the entire window before cleaning for the most efficient path
Dual edge detection sensors prevent the robot falling off frameless glass panels
Cross-shaped water spray covers 40% more surface area per pass than circular sprayers
Auto-return feature brings the robot back to its starting position after completing the clean
Watch Out For
Premium pricing at £399 makes it the most expensive model in this test
The square design catches on window handles and stays, requiring manual repositioning
App connectivity drops frequently on 2.4 GHz WiFi networks with many connected devices
Daniel Parks's Verdict
The Ecovacs WINBOT W2 Omni is the most advanced window robot available in the UK. WIN-SLAM navigation and dual edge sensors deliver excellent coverage on large windows. But at £399, it costs £50 more than the HOBOT 2S for marginal improvements. Worth it only for frameless glass and very large windows.
Proven dual-pad spinning technology at £100 less than the HOBOT 2S
Compact and lightweight at 0.98 kg, the lightest window robot in our test
Works on both framed and frameless glass with adjustable suction settings
Remote control included for manual override and spot cleaning specific areas
Watch Out For
No automatic water spray, you must pre-wet the pads or glass manually
Older navigation algorithm follows a random pattern rather than systematic zigzag
Suction power at 2,800 Pa is noticeably weaker than the HOBOT 2S on vertical glass
Daniel Parks's Verdict
The HOBOT 388 is the best budget window cleaning robot. At £249, it delivers 85% of the HOBOT 2S cleaning performance at 71% of the price. The manual pre-wetting is the only real inconvenience. If you can live without auto-spray, this is excellent value.
Any model works. The HOBOT 2S (£349) is our top pick for standard UK double-glazed windows. AI navigation and auto-spray deliver streak-free results consistently.
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Large Glass Panels
Bi-fold doors, floor-to-ceiling windows, patio doors. The Ecovacs W2 (£399) with its 5.5 m cable and WIN-SLAM navigation handles panels up to 3 metres tall.
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Conservatory
Angled roof panels and horizontal glass. The HOBOT 398 (£299) has enhanced suction that grips surfaces up to 15 degrees from vertical. Works on both glass and polycarbonate.
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Budget
The Mamibot W120-T (£179) gets you into window robot cleaning for under £200. Acceptable results on lightly soiled glass. For better cleaning, the HOBOT 388 at £249 is worth the upgrade.
Yes, if you have 8+ windows or hard-to-reach glass. A professional window cleaner charges £5 to £10 per window (£50 to £100 per visit). A HOBOT 388 costs £249 and cleans your windows for 3p to 5p per session. It pays for itself after 3 to 5 professional cleans. For single-storey homes with 4 to 5 easy windows, a squeegee is fine.
QWhich window cleaning robot should I buy?
The HOBOT 2S (£349) for most UK homes. It has auto-spray, AI navigation and excellent edge coverage. The HOBOT 388 (£249) for budget buyers who can manually pre-wet glass. The HOBOT 398 (£299) for conservatories. The Ecovacs W2 (£399) for frameless glass and very large windows.
QCan window robots clean shower glass?
Yes, if the glass panel is large enough (minimum 40 x 40 cm). Window robots work well on smooth shower glass, removing limescale and soap residue. Use a limescale remover spray first for heavy buildup, then run the robot for a streak-free finish. The compact HOBOT 388 at 0.98 kg is ideal for bathroom glass.
QHow noisy are window cleaning robots?
Window cleaning robots generate 62 to 67 dB, roughly equivalent to a normal conversation or a running dishwasher. The HOBOT 388 is the quietest at 62 dB. The Ecovacs W2 is the loudest at 67 dB. None are loud enough to disturb neighbours through closed windows.
Daniel Parks
Smart Home & Robotics Specialist
Daniel has spent 6 years testing smart home devices and cleaning robots for UK households. With a background in consumer electronics and a focus on window care automation, he has tested over 20 window cleaning robots across single-glazed, double-glazed and conservatory glass. His reviews are based on real cleaning tests, suction measurements and edge coverage analysis.
