Owning a smart home is not just about comfort, it's also about keeping your equipment up to date. The robot vacuum cleaners Xiaomi and Roborock are famous for their navigational accuracy, which is directly dependent on the purity of the optical sensors. If you notice that your device is getting stuck, building incorrect maps, or can't find a base, the problem is often the banal contamination.
Dust, pet hair, and small debris accumulate over time on the lenses and in sensor windows, disrupting infrared beams and laser scanners, causing algorithms to go wrong. In this article, we will detail where key navigation elements are and how to safely clean them without damaging delicate electronics.
Regular maintenance of sensors is a key breakage prevention that prolongs the life of your gadget. Ignoring the simple hygiene rules of the device can lead to the robot becoming blind and useless assistant. Consider the main types of sensors and the specifics of their care.
Types of sensors and their location on the body
Modern robot vacuum cleaners are equipped with a complex of sensors, each of which performs a different function. Understanding their purpose will help you quickly identify the source of the problem when the device is not working properly.
The most vulnerable and important element is the LDS laser rangefinder, which sits on the top of the housing in a characteristic tower ledge, which scans the room and builds a map. Below, at the bottom of the housing, are cliff-sensors that prevent falling from stairs, and collision sensors. Also critical is the optical floor sensor, which helps the device to identify the surface and navigate in the absence of the laser module.
⚠️ Note: Some Roborock models have additional carpet sensors that also require cleanliness for correct gender type recognition.
Contamination of any of these elements leads to a chain reaction of errors. For example, if the cliffs sensor is dusty, the robot can "see" a non-existent staircase in the middle of the room and refuse to clean this area. Laser module covered with a layer of dust will create "noisy" maps with extra walls or obstacles.
Preparation for cleaning and necessary tools
Before you start maintenance, you need to properly prepare the workplace and tools. Using the wrong materials can irrevocably ruin the optics. You don't need a sophisticated professional tool, just a minimal set that you can find in every home.
For high-quality cleaning, you will need:
- 🧹 Dry soft microfiber or lilac-free fabric is the ideal material that does not leave fibers.
- 💨 A container with compressed air - for blowing dust out of hard-to-reach crevices.
- 💧 Distilled water - for slightly wet cleaning of strong contaminants (optional).
- 🔦 Flashlight - for visual inspection of the condition of the lenses in good lighting.
It is strongly discouraged to use aggressive household chemicals, alcohol-containing solvents or abrasive sponges. Chemicals can cloud the plastic of the lenses, and abrasives will leave micro-scratch marks that will scatter light and distort the sensor readings. Also avoid using paper wipes, as they can scratch the surface.
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Before starting cleaning, be sure to turn off the robot vacuum cleaner and disconnect it from the charging station to avoid accidentally turning on the motors or rotating the brushes.
Cleaning of the laser rangefinder (LDS)
The laser module is the eyes of your robot. In Xiaomi and Roborock, it's usually protected by a transparent plastic dome, but the dust settles on it and inside the protective casing, and cleaning this unit requires special care, because it has a rotating mechanism inside.
First, wipe the outer plastic dome with a dry microfiber in circular motions. If the contamination is severe, the fabric can be slightly moistened with distilled water, but make sure that moisture does not enter the crevices. After external cleaning, inspect the lateral slots through which the laser exits. Often there is a puff that accumulates, which interferes with the beam.
To remove dust from the internal machinery, use a compressed air can. Blow the side holes with short presses, trying not to twist the mechanism with your fingers. If you see that there is dust on the mirror itself inside, you can try to remove it with a cotton swab, but you need to do this extremely carefully so as not to knock the calibration.
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The purity of the laser rangefinder directly affects the accuracy of map construction and the robot’s ability to return to the base for charging.
Lower sensor maintenance: floor and height difference
The bottom of the robot vacuum cleaner is a dusty area, and it's where the cliffs and the optical track sensor are located, and these are often clogged with a thick layer of dust and wool, especially if you're cleaning on carpets.
Turn the device over and look at the bottom panel, and you'll see some dark windows, and the cliffs are usually perimeter-sensors, and the floor sensor is in the center or closer to the main brush, and you'll need to wipe each window carefully with a dry microfiber, and the movements should be light, without strong pressure.
If you're using a robot on dark floors or black carpets and it constantly "thinks" it's a pit, cleaning those sensors is a must. The black surface absorbs infrared radiation, and dirt on the lens exacerbates this effect by causing the robot to avoid certain areas. Also check the charging contacts located next to the sensors and wipe them with dry cloth to ensure stable charging.
☑️ Checklist of service of the lower panel
Collision sensors and side sensors
The front bumper of a robot vacuum cleaner is not just mechanical protection, it has infrared collision sensors built into it. It allows the device to "feel" approaching furniture before physical contact. On some models, such as the Roborock S6 or S7, these sensors are represented as black stripes or dots on the front panel.
Contamination in the front sensors causes the robot to either stop too often to "see" non-existent obstacles, or, conversely, to ram furniture because it does not feel it coming. Rub the front panel and bumper area with each cleaning of the dust collector. This takes a few seconds, but significantly improves navigation.
Side sensors, if they're present in your model (usually small windows on the sides of the body), also need attention. They help the robot navigate along the walls and not get lost in narrow passages. Use a dry cotton swab to clean narrow gaps around these sensors where the fabric will not crawl.
⚠️ Note: Do not use wet wipes to wipe the collision sensors, as moisture can leak into the bumper body and oxidize the contacts.
Table of frequency of sensor maintenance
To make your robot vacuum cleaner work like new, it is important to follow a maintenance schedule, and the frequency of cleaning depends on the operating conditions: the presence of pets, the type of flooring and the dustiness of the room.
| Type of sensor | Frequency of cleaning | Signs of pollution | Tool. |
|---|---|---|---|
| Laser LDS | Every 1-2 weeks | Stripes on the map, loss of location | Microfiber, air |
| cliffs sensors (bottom) | Once a week. | Refusal to remove dark areas, fall errors | Dry fabric |
| Collision sensors | Once every 2 weeks | Frequent stops, hits on furniture | Microfiber |
| Optical floor sensor | Once a week. | Chaotic movement, loss of position | Dry fabric |
If you have animals that molt, you have to double the service frequency of all the sensors, especially the lower ones, and the wool has the ability to quickly clog the optics and create static electricity that attracts dust.
What to do if the cleaning didn’t help?
Frequent maintenance errors and troubleshooting
Users often make mistakes trying to "improve" the robot, and one of the most common is using glass sprays, leaving a rainbow film that critically distorts infrared radiation, and another mistake is trying to disassemble the laser module completely, which will take away your warranty and almost certainly knock the laser calibration.
Also worth mentioning is the problem with black carpets. Even perfectly clean sensors can mistakenly perceive black pile as a cliff (ladder), in which cases manufacturers recommend taped cliffs sensors with special tape (company) or use virtual walls in the application, but only after thorough cleaning.
If the robot makes strange noises when the laser is spinning, or you see a physical crack in the lens, no cleaning will help, and then you need to replace the component, and regular visual inspection will help detect mechanical damage at an early stage.