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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.
4Models Tested
15°Max Angle from Vertical
£299vs £150-250 Pro Clean
#1
Best for Conservatories
HOBOT 398
4.3/10Our 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.
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.
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.
QDo 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.
QHow 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.
QHow 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.
