If window cleaning is not your favorite type of house chore, then you might want to consider purchasing one. Also, if you live on a higher floor or your window does not open, it is a great and safe way to enjoy a clean environment.

Window cleaning robots are also very useful in commercial premises for cleaning your office or shop windows.

Window-cleaning robots need a power source to operate

Wired robots (recommended)
If you want a smooth cleaning without interruption and not to worry about recharging the batteries, go with the wired window-cleaning robots. Also, they come with a built-in emergency battery in case of an electricity outage. It allows the robot not to fall on the ground.

Wireless robots
Wireless (battery-powered) robots need charging, so you want to plan the cleaning. Also, the amount of cleaning time is limited depending on the battery life.

Great question! The window-cleaning robot can also clean mirrors, tiles, shower cabins, and conservatory glasses. Some models can even clean the TV screen and uneven surfaces.

People, who have window robots, encounter a problem – their robots cannot reach edges and corners. Some manufacturers have solved this problem by creating square-shaped devices, because such a design makes it easier to adapt to the edges of the window. In terms of “Hester M3 PRO “, its angles are also rounded – it not only cleans corners and edges, but also does not damage and scratch the window frame.

The maintenance of the robot is minimal – all you have to do is wash the cloths, clean the castors and charge the battery(if needed). It is recommended to wash the cloths after each cleaning by hand or in the washing machine, at a low temperature of up to 30 degrees, without using a fabric softener and other rinsing agents. The castors and caterpillars are also recommended to be cleaned after each cleaning with a damp cloth so that they will not leave traces on the glass.

Window-cleaning robot stays on the surface usually in two ways: by a powerful vacuum pump or magnetic connector. Robots with the magnetic connector are fixed on one side of the window and the magnet on the other. It can be a problem if the windows are partitioned or unbraced.

The robot is smart and, therefore, it does almost all the work itself. All you have to do is to put on the cloths, connect the robot to the mains and attach the safety rope. When the robot is ready for work, place it on the surface and, after pressing the power button, specify the cleaning program. If your robot does not have an automatic liquid spray function, then you will have to manually moisten the cloths.

Various protection systems ensure smooth and safe cleaning. A powerful vacuum pump keeps a strong suction so the robot won’t fall from the surface. Edge detection usually prevents the robot from falling during frameless surface cleaning. Extra batteries keep the device on the window in case of power cuts, and a safety rope keeps the robot from crashing on the ground if it does fall.

Each window-cleaning robot can come with different cleaning stages that allow it to effectively clean the surface. It can include different cleaning paths and modes. For example, a robot can wet clean the window and then polish it, leaving a sparkling and clean finish.

All the window-cleaning robots we tested can be controlled using either a remote control or a smartphone. To control the robot with a smartphone, you need to download and install a dedicated app. You also need to make sure your phone has enough battery while using it.

Both control methods allow you to select cleaning programs, change the direction of movement, return the robot to its starting point, or repeat the cleaning process in areas that require extra attention.

All five models we tested automatically return to their starting point once they have finished cleaning. This means there is no need to manually guide the robot back to a reachable position before moving it to another window or surface.

Unfortunately, there are still window-cleaning robots on the market that do not clean the entire window and may stop in random or hard-to-reach places.

In all cases, we recommend using only the fluid specified by the manufacturer of the robot. If, however, no fluid has been specified by the manufacturer, then use a cleaning fluid that does not foam and does not leave a film on the surface resulting from chemicals it contains.

Each manufacturer states differently, so make sure to read the user manual. As a standard, robots are not recommended to be used during rain, snow, or when the temperature drops below +5°C.

During our testing, we noticed that the quality of the cleaning cloths has a significant impact on cleaning performance. Different cloths absorb different amounts of dirt and moisture, which can affect how often they need to be replaced and whether streaks are left behind.

The HESTER M3 PRO performed particularly well in this area. Its cleaning cloths are thicker and softer, with longer fibres that absorb moisture and dirt effectively. During our tests, we were able to clean the same windows while changing the cloths less frequently, without leaving noticeable streaks behind.

The manufacturer has also paid attention to how securely the cloths are attached to the robot. Throughout our testing, the HESTER M3 PRO cloths remained firmly in place and did not slip off during cleaning.

Wet cleaning

Window-cleaning robots generally use either dry or wet cleaning. Dry cleaning relies on the cleaning cloths alone, while wet cleaning uses liquid to help loosen dirt and clean the glass more effectively.

Manual moistening

With robots that do not have an automatic spraying system, the user needs to periodically remove the robot and manually moisten either the cleaning cloth or the window surface. This may need to be repeated several times when cleaning larger windows.

Automatic moistening

Robots equipped with an automatic spraying system can dispense cleaning liquid directly onto the glass while they are working. This helps keep the cleaning surface appropriately moist throughout the cleaning cycle.

Advantages of automatic moistening

Automatic spraying makes the cleaning process considerably more convenient because there is less need to monitor the cloths and manually re-moisten them. If the cloth becomes too dry, cleaning performance may decrease and streaks or uncleaned areas can remain on the glass.

The HESTER M3 PRO uses an automatic spraying system that distributes cleaning liquid while the robot moves across the window. This helps maintain consistent moisture and allows the robot to continue cleaning with less manual intervention.

For the user, this means less stopping, less manual spraying and a more convenient window-cleaning process overall.

 Window cleaning robots have powerful motors, which make noise when they operate. To reduce the noise, the manufacturers install sound insulation systems, which reduce the emitted sound to about 60-70 dB. The sound of 60 dB is equal to laughter, while the sound of 70 dB – to the hum of the hair dryer. Therefore, a difference of as many as 10 decibels is quite significant when we talk about a quite environment at home.

The “Hester M3 PRO” is powerful, but silent. Its 80 W motor emits a sound of up to 60 dB. Other robots emit a sound of 70 dB, because they are slightly more powerful than the “OVOX” robot. But we did not notice that it has a big impact on the difference of the duration of the operation.