Cleaning up Xiaomi Roborock’s robot vacuum sensors: a complete guide with expert advice

Xiaomi Roborock’s robot vacuum cleaners have become indispensable cleaning tools, but their effectiveness depends on the cleanness of the sensors. Dusty or contaminated sensors lead to chaotic movement, debris leaks, collisions with furniture and even complete shutdowns. According to service centers, 70% of complaints about “stupid” robot vacuum cleaners are solved by simply cleaning optical and infrared sensors.

In this article, you will find detailed instructions for cleaning all types of sensors (laser, bumper, cliff sensors, etc.) for Roborock models. S4/S5/S6/S7/S8, And we'll look at what tools are safe and what tools can damage sensitive optics, and we'll explain why a standard eyeglass wipe isn't always the right fit here.

If your robot starts to go blind, ignore obstacles, or fall down stairs, don't rush to carry it for repair. 9 out of 10 cases, the problem is contaminated sensors that can be cleaned on their own in 10 to 15 minutes.

What sensors are in the robot vacuum cleaners Xiaomi Roborock and what they are responsible for

Today’s Roborock models are equipped with a set of 5-8 types of sensors, each of which performs a different function, and understanding their purpose will help to more accurately diagnose problems and purposefully clean only those sensors that have failed.

The main types of sensors:

• 🔦 laser sensor (LDS) — Scanning the room, building a map (is in models) S5/S6/S7/S8). Pollution leads to drunk driving in circles.
• 🚧 Bumper sensors -- infrared sensors on the front bumper, detect obstacles. If they're dirty, the robot hits furniture.
• 🪨 Cliff sensors, infrared sensors under the bottom, prevent falling down stairs, and dust causes the robot to "fear" flat surfaces.
• 📏 Wall sensors – determine the distance to vertical surfaces (for example, to bypass the legs of chairs).
• 🔋 Charge sensors, which dock with the docking station, and the dust on the contacts causes charging problems.

In Roborock models S7+ and S8 Pro Ultra added ultrasonic sensors to recognize carpets and difficult obstacles – they also need to be cleaned every 1-2 months.

How do you know which sensor is contaminated?

Preparation for cleaning: tools and precautions

Before you start cleaning, prepare the necessary tools and make sure you do everything right. Improper cleaning can damage the optics of sensors or leave scratches on plastic surfaces.

You'll need:

• 🧴 Isopropyl alcohol (70-90%) is the best treatment for optics. Do not use vodka or cologne!
• 🧻 Microfibre wipes without pile (for example, for glasses or appliances).
• 🪄 Cotton swabs - for hard-to-reach places (for example, bumper slits).
• 💨 A cylinder with compressed air (optional) - for blowing dust out of the crevices.
• ⚠️ Do not use: paper wipes, rough fabrics, acetone, gasoline or aggressive detergents.

⚠️ Warning: Never blow your mouth at sensors — saliva contains fats that leave the film on the optics. Also avoid direct sunlight hitting the laser sensor during cleaning: this can knock its calibration.

Before the start of the work:

1. Turn off the robot vacuum cleaner with the power button.
2. Remove the battery (if the model allows) or at least disconnect from the docking station.
3. Work on a flat surface so as not to drop the robot.

Shut off power to the robot vacuum cleaner

Prepare isopropyl alcohol and microfiber

Remove foreign objects from the working surface

Photograph the location of sensors (for complex models)-->

Step-by-step cleaning of the laser sensor (LDS) Roborock models S5/S6/S7/S8

Laser sensor (aka laser sensor) LDS-The scanner is the most important and vulnerable element of navigation, and it rotates at 5 revolutions per second, and even microscopic dust particles on the lens distort the map of the room.

How to clean:

1. Turn the robot over and find a round glass lens on the top cover (in models) S7/S8 It's hidden under a removable plug).
2. Moisten the microfiber napkin with isopropyl alcohol and neat circular movements, wipe the lens.
3. To remove dust from the cracks, use a cotton swab dipped with alcohol.
4. Allow the alcohol to completely evaporate (2-3 minutes) before turning on.

Roborock S8 The Pro Ultra has an improved dust-proof laser module, but it still needs to be cleaned every 1-2 months. In this model, the lens is located under a removable lid - gently tuck it into a plastic spatula.

⚠️ If after cleaning the robot continues to drive in circles, check if the calibration has gone wrong. LDS. To reset, hold the power button for 10 seconds (until the beep).

Cleaning bumper and cliff sensors: infrared optics

Infrared sensors (IRs) are most susceptible to contamination, as they are located on the front bumper and under the bottom of the robot, and dust, animal hair and even ordinary household dirt block their signal.

Bumper sensors (front):

• 🔍 Find small black windows on the front bumper (usually 2-4 pieces).
• 🧴 Wipe them with a cotton swab soaked in alcohol. Move from center to edge.
• 💨 Use compressed air to blow dust out of the gaps between the bumper and the body.

Cliff sensors (bottom of the robot):

• 🪛 Turn the robot over and find 2-4 round or rectangular "eyes" under the front.
• 🧻 Clean them with a dry microfiber, then wipe them with alcohol. Avoid getting moisture inside the case!
• ⚠️ Do not use sharp objects – cliff sensor plastic is thin and scratches easily.

In Roborock models S7 MaxV and S8 Pro Ultra added object recognition cameras, their lenses cleaned just like they do. LDS, But with even greater caution, cameras are sensitive to scratches.

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If the robot is still afraid of carpets after cleaning the cliff sensors, try calibrating the sensors. To do this, place the robot on a flat surface and hold the Spot Clean buttons. + Dock 5 seconds before the beep.

Cleaning the charge sensor and docking station contacts

Charging problems are one of the most common complaints of Roborock owners: 80% of the time, contaminated contacts on a robot or docking station are to blame, and oxidation or dust on metal plates leads to poor contact and intermittent charging.

How to clean:

1. Disconnect the docking station from the network.
2. Wipe the contacts on the robot and station with a dry microfiber (no alcohol!).
3. For persistent contaminants, use a pencil eraser - it removes oxidation well.
4. Check that the contacts on the station and the robot coincide in height (sometimes they bend when falling).

If the robot does not dock with the dock even after cleaning, check:

• 🔌 Correct connection of the station to the network (the indicator should be green).
• 📍 Location of the station – the robot must “see” it from a distance of 1-1.5 meters.
• 🔄 Settings in the Mi Home app: station binding sometimes gets lost.

⚠️ Warning: If the contacts at the docking station become blackened or deformed, do not try to straighten them - this can lead to a short circuit.

Prevention: How to reduce sensor pollution

Cleaning sensors regularly is good, but it's even better to prevent them from becoming contaminated quickly. Here are some proven ways to do this:

1. Optimize the cleaning schedule

• 📅 Running the robot 1 time a day for 10-15 minutes instead of one long cycle once a week.
• 🌪️ Use Turbo mode only on carpets – Standard mode is sufficient on smooth surfaces.

2.Care for the robot after cleaning

• 🧹 Clean the main filter and garbage container after each cleaning.
• 🪟 Wipe the body of the robot with a dry wipe, especially the cracks around the bumper.
• 🚿 Once a month, wash the side brush and main shaft (if the model supports wet cleaning).

3. Protection against pets

• 🐶 If you have a dog or cat, clean the sensors once every 2 weeks – the coat quickly clogs up the IR sensors.
• 🚫 Avoid cleaning immediately after molting pets - hair can stick to optics.

In Roborock models S8 Pro Ultra is a self-cleaning function for the dock, but it's not a substitute for manual sensor cleaning. Automatic washing only removes debris from the brushes, not dust from the optics.

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Regular prevention increases the life of sensors by 2-3 times. Roborock robots, which are monitored, work without failure 5-7 years, while running models begin to “glutch” after 1-2 years.

Frequent Mistakes in Sensor Cleaning and How to Avoid Them

Many users make mistakes that not only don't help, but also make sensors less efficient, and the most common ones are:

1. Use of inappropriate means

• ❌ Error: Cleaning with alcohol concentrations below 70% or household chemicals (e.g. Mr. Proper).
• ✅ Solution: Isopropyl alcohol 70-90% or special wipes for optics.

Excessive pressure during cleaning

• ❌ Mistake: Pressing on the lens LDS or cliff sensors, which leads to microcracks.
• ✅ Solution: Move the napkin in light circular movements without pressing.

3. Neglect of drying

• ❌ Error: Turning on the robot immediately after cleaning with alcohol, when the moisture has not evaporated.
• ✅ Solution: Let the robot stand for 5-10 minutes after cleaning.

4. Clean only "visible" sensors

• ❌ Mistake: Only cleansed LDS, Ignoring cliff sensors and bumper sensors.
• ✅ Solution: Follow the complete procedure to clean all sensors (see section above).

If the robot gets worse after cleaning (for example, it stops seeing walls), then you could erase the factory markings from the sensors or knock them down, in which case resetting to the factory settings (hold the power button for 20 seconds) will help.

FAQ: Answers to Frequent Questions