Cleaning windows is one of those household chores that looks simple until you have large glass panels, high-rise windows, mirrors, or hard-to-reach areas. Traditional cleaning requires a bucket, spray bottle, cloth, squeegee, and plenty of time. More importantly, cleaning exterior glass at height can involve significant safety risks. This is where the 2026 Liectroux S9 Robot Window Vacuum Cleaner attempts to make a difference.

Designed with 2 roller brushes, a 6-way water spray system, powerful suction, intelligent navigation, app, and a remote control, the S9 is designed to automate much of the window-cleaning process. The manufacturer lists features including automatic edge recognition, eight microswitches, a backup battery, a safety rope, and compatibility with framed and frameless glass.

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What Is the Liectroux S9?

The Liectroux S9 is a robotic glass-cleaning device that attaches itself to a smooth vertical surface using vacuum suction. Once positioned correctly, it moves across the glass while its cleaning system works to loosen and remove dirt.

The S9 is particularly interesting because it combines dual roller brushes with water spraying rather than relying exclusively on a dry cleaning pad. Its six-way pump-based spray system is designed to distribute cleaning liquid across the working area, helping soften dust and marks before the brushes and cleaning cloths pass over the surface.

For homeowners with large windows, glass doors, mirrors, shopfront-style glass, or floor-to-ceiling windows, this design could make routine maintenance considerably easier.

10,000Pa Suction for Secure Attachment

One of the headline specifications of the 2026 Liectroux S9 is its 10,000Pa suction power. Strong suction is essential for a window-cleaning robot because the device must remain attached to a vertical surface while moving.

The S9 is also designed to automatically adjust suction according to different glass surfaces. Its system can detect air leakage and respond by moving back, while the built-in backup battery is designed to keep the robot attached for approximately 30 minutes if power is unexpectedly interrupted.

That does not mean users should treat the robot as completely fail-safe. The safety rope should always be installed and secured properly, particularly when cleaning exterior windows or glass at height.

Dual Roller Brushes for Deeper Cleaning

Another major feature is the two roller-brush design. Instead of depending only on a flat wiping cloth, the S9 uses rotating brushes to help loosen everyday dirt and marks.

This can be useful on windows that accumulate fingerprints, dust, light stains, water marks, and other common surface contamination. The manufacturer also pairs the roller brushes with high-density fiber cleaning materials designed to clean glass without scratching the surface.

Of course, the result will still depend on how dirty the window is and whether the cleaning pads and rollers are maintained properly. Very old, dried-on stains may still require manual treatment before or after using the robot.

Six-Way Water Spray System

The S9's 6-way water spray system is another feature that separates it from basic robotic window cleaners. According to the manufacturer, the system uses a water pump and multiple spray nozzles rather than a simple atomizing blade. This approach is intended to provide more consistent liquid distribution and reduce the likelihood of clogging.

Water helps loosen dirt before the cleaning rollers pass over the glass. However, users should follow the manufacturer's recommendations regarding the type and amount of cleaning solution used. Excessive liquid can interfere with the robot's movement and suction, so more water does not necessarily mean better cleaning.

Intelligent Navigation and Edge Detection

The Liectroux S9 uses gyroscope-based navigation and can follow Z-shaped and N-shaped cleaning patterns. This allows the robot to systematically travel across a window instead of moving randomly.

Its eight microswitches, positioned around the corners, help detect edges and improve directional control. The manufacturer also states that the robot can recognize borders and automatically adjust its direction.

This is especially useful for large windows where manually controlling every movement would become tedious.

App and Remote-Control Operation

Convenience is another major selling point. The S9 supports Tuya/Smart Life app control and comes with a 2.4GHz remote control. The manufacturer's listing states that the remote can operate from up to 20 meters without requiring directional pointing.

This gives users flexibility. Someone who prefers a smartphone can use the app, while a traditional remote may be more convenient when standing near the window.

The product also provides voice prompts, which can make operating status easier to understand during cleaning.

Important Usage Rules

Despite its automated design, the S9 should not simply be attached to a window and left unattended. Correct setup is essential.

First, inspect the glass and make sure the surface is suitable for the robot. Remove loose dirt or debris that could interfere with the suction seal. Install the cleaning pads or roller components correctly and make sure they are clean.

Next, attach the safety rope securely before starting. The combined power-cord and safety-rope design is intended to reduce tangling, but the rope still needs to be anchored properly.

The electrical connection should remain stable during operation. Before cleaning a large or high window, it is sensible to test the robot on a smaller, accessible glass surface first.

Users should also avoid applying excessive water. Keeping the spray system clean is important because blocked nozzles can reduce the effectiveness of water distribution.

After cleaning, remove and wash the reusable cleaning materials as recommended. Dirty pads can simply move grime around instead of producing a clear finish.

Who Should Consider the Liectroux S9?

The S9 makes the most sense for people who regularly clean large glass surfaces. It can be particularly attractive for homes with expansive windows, glass balconies, mirrors, sliding glass doors, and other smooth surfaces.

It is also useful for anyone who finds manual window cleaning physically tiring. Rather than repeatedly stretching, reaching, and wiping, the robot can handle much of the repetitive movement.

However, it should be viewed as a maintenance-cleaning tool rather than a complete replacement for manual deep cleaning. Heavy grime, stubborn mineral deposits, damaged surfaces, or unusual glass textures may still require conventional cleaning.

Final Verdict

The 2026 Liectroux S9 Robot Window Vacuum Cleaner is an interesting step toward more automated household maintenance. Its combination of 10,000Pa-class suction, dual roller brushes, six-way water spraying, intelligent navigation, edge detection, backup power, safety rope, app control, and remote operation gives it a strong feature set for a robotic window cleaner.

Its biggest significance is not simply that it can clean glass automatically. The real benefit is reducing the repetitive work involved in maintaining large or difficult-to-reach windows. When used correctly, it can turn a traditionally manual chore into a more controlled and convenient process.

That said, safety remains the most important consideration. Users should always follow the instruction manual, secure the safety rope, inspect the cleaning surface, maintain the pads and spray system, and never assume that a robotic cleaner eliminates the need for supervision.