My window-cleaning robot leaves a streak in the centre of the glass every pass
Home Nura guide — category Window Cleaning Robots
Diagnosis
This symptom is common and usually harmless. In most cases, a targeted clean or a small change in usage fixes the problem in under ten minutes.
Recommended procedure
Unplug the device, let it cool down, then clean the affected part with warm water and mild soap (never abrasive sponges on non-stick coatings). Reassemble, plug back in and run a short empty cycle to test.
Other common failures on this category
These incidents affect the same type of appliance — diagnosis and recommended procedure for each.
- Window Cleaning RobotsMy window-cleaning robot keeps losing grip and nearly falls
- Window Cleaning RobotsMy window-cleaning robot leaves streaks after every pass
- Window Cleaning RobotsMy window-cleaning robot beeps non-stop and reports low suction
- Window Cleaning RobotsThe suction pad on my window-cleaning robot is losing grip and the unit slides
Frequently asked questions
In Europe, any window cleaning robots bought new from an official reseller benefits from a legal conformity guarantee of at least two years (Directive (EU) 2019/771). This guarantee covers defects present at delivery, whenever they first manifest.
You can pick: European law puts the legal guarantee on the seller, not the manufacturer. In practice, a store return is usually faster, but the manufacturer can repair if the damage is out of warranty. Keep proof of purchase.
Our public methodology adds a Nura Score /10 penalty to any window cleaning robots whose recurring failures are documented in European user feedback. A model that breaks too often never tops our charts, brand notwithstanding.
Yes, within the limits of the European "right to repair": routine maintenance tasks (cleaning, gasket replacement, calibration) never void the legal warranty. Only irreversible hardware modifications can be a problem. For a window cleaning robots, any handling documented in the manufacturer's manual stays covered.
The directive imposes a two-year legal conformity guarantee, with a presumption of pre-existing defect during the first twelve months — the burden of proof is on the seller. For a window cleaning robots that breaks in that window, you're entitled to free repair or replacement, no strings attached on typical use.