Last updated: 24 March 2026

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Best Window Cleaning Robots for Conservatories

Your conservatory looked stunning when it was built. Now the roof is green with algae, the side panels are streaked with rain marks, and you can barely see the garden through the grime. Professional conservatory cleaning costs £150 to £250. Climbing on the roof is dangerous and voids most warranties. A robot designed for angled glass solves this for £299, used as many times as you want.

Best for Conservatories

HOBOT 398

4.3/10 Our Score £299

Suction3,200 Pa

Pad Speed550 RPM

Noise63 dB

Battery Backup20 min UPS

Cleaning Quality88%

Value for Money80%

Edge Coverage85%

What We Like

Specifically designed for angled and horizontal glass including conservatory roof panels
Enhanced suction at 3,200 Pa maintains grip on tilted surfaces up to 15 degrees from vertical
Ultrasonic spray system works in any orientation, unlike gravity-fed spray systems
Edge-to-edge cleaning reaches within 1 cm of window frames on standard UK double glazing

Watch Out For

At £299, it sits awkwardly between the budget 388 and premium 2S in the HOBOT range
Heavier than the 388 at 1.2 kg, though still lighter than the Ecovacs W2
The longer 6-metre cable is useful for conservatories but tangles more easily on standard windows

Daniel Parks's Verdict

The HOBOT 398 is the best window robot for conservatories. The enhanced suction handles angled glass that other robots slide off, and the ultrasonic spray works regardless of orientation. If you have a conservatory, this is the model to buy. For standard vertical windows, the HOBOT 2S or 388 are better value.

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Why Conservatories Need Special Robots

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Angled Glass

Conservatory roof panels sit at 20 to 35 degrees from horizontal. Standard window robots are designed for vertical glass (90 degrees). Only models with enhanced suction (3,200+ Pa) maintain grip on tilted surfaces.

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Outdoor Exposure

Conservatory glass collects bird droppings, tree sap, moss, pollen and rain residue. This is harder to remove than indoor window grime. Auto-spray with cleaning solution (not just water) is important for outdoor conservatory panels.

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Cable Reach

Conservatory roofs require longer cables. The HOBOT 398 has a 6 m cable, the longest in our test. This reaches most conservatory roof panels from a ground-level power socket inside the conservatory.

Safety warning: Never stand or walk on a conservatory roof. Glass and polycarbonate panels are not load-bearing. Use the robot from inside the conservatory via access panels, or from a stable step platform for external side panels. Never lean ladders against conservatory frames.

Top 5 Window Robots HOBOT Range Large Windows Buying Guide

Frequently Asked Questions

Q Can a window robot clean a conservatory roof?

Yes, if the robot is designed for angled surfaces. The HOBOT 398 handles glass panels up to 15 degrees from vertical. Standard robots (HOBOT 2S, Ecovacs W2) are designed for vertical glass and may lose suction on angled conservatory roof panels. Always check the model specifications.

Q Do window robots work on polycarbonate conservatory panels?

Most do, but check compatibility. Polycarbonate is slightly flexible, which can affect suction seal. The HOBOT 398 works on polycarbonate panels tested in our conservatory. Avoid aggressive cleaning solutions that may scratch or cloud polycarbonate over time.

Q How do I clean a conservatory roof safely?

Never walk on a conservatory roof. Use a robot window cleaner from inside (for glass roofs with access panels) or from a secure step platform. The HOBOT 398 with its 6 m cable can reach most conservatory roof panels from inside the conservatory without any climbing.

Q How often should I clean my conservatory?

Every 3 to 4 months for roof panels (which collect bird droppings, moss and pollen) and monthly for side windows. In autumn, clean the roof after the last leaf fall. Regular robot cleaning prevents buildup that becomes harder to remove over time.

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.

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Still deciding? The Ecovacs WINBOT W2 Omni is our top recommendation for most UK homes.

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