How to clean the robot vacuum cleaner Xiaomi Mi Robot: instructions from A to Z

Xiaomi Mi Robot has become an indispensable cleaning assistant for thousands of users, but its effectiveness depends on regular maintenance. Many owners face problems with reduced suction power, navigation errors or unpleasant odor - all of which are most often caused by contamination of key nodes. Unlike conventional vacuum cleaners, where it is enough to change the bag, the robot requires a comprehensive cleaning at least once every 1-2 weeks.

In this article, we will discuss the unique design features of Xiaomi Mi Robot (including the S50, S51, S55 and others) that the manufacturer rarely mentions in official instructions - for example, how to properly clean the laser rangefinder without risking damage to the lens or why you can not wash the main filter under running water.

We're going to focus on the hidden dust storage areas that 80 percent of users don't even know about, which are the cavities under the side brushes, the duct duct ducts, and the micro-slits in the case, where the dust plugs eventually form, and if you notice that the vacuum cleaner has started to deafen on the carpets or leaves a lane of debris, it's probably the place where the problem lies.

1.Preparation for cleaning: what will be needed and safety measures

Before you start disassembling, make sure you have:

• 🧹 Soft brush (makeup or dental) to clean the gaps
• 🧴 Isopropyl alcohol (70% and higher) for sensor processing
• 🧽 Microfiber wipe without pile
• 🔧 Plastic blade or mediator for removal of caps
• 💨 Narrow-headed compressor (optional, but extremely useful)

Important: Xiaomi Mi Robot has a sealed dust collector, but that doesn't mean it can be washed under a stream of water. Battery contacts and electronic boards are located at the bottom of the case - moisture will lead to corrosion and failure. Always remove the vacuum cleaner from the socket (if it's charging) and remove the battery during deep cleaning.

⚠️ Warning: Never use metal objects to clean side brushes, their plastic gears break easily. If the hair or thread is too tightly wound, carefully cut them with scissors, before blocking the brush (press it with your finger).

For models with laser rangefinder (LDS), prepare a separate dry brush — even micro-scratches on the lens lead to mapping errors. If the vacuum cleaner begins to "lose" in familiar rooms or draw chaotic routes, in 90% of cases, a contaminated sensor is to blame.

2. Cleaning of the main dust collector and filters: step-by-step instructions

The central dust container is the heart of the vacuum cleaner, and improper cleaning results in a 30-50% loss of suction power. Mi Robot models use a cyclone filter system where debris is separated from the air by centrifugal force. Over time, the walls of the container form a sticky layer of fine dust and hair that cannot be removed simply by shaking the debris.

How to clean properly:

1. Remove the container by pressing the release button on the back.
2. Remove large garbage by hand, then wash the container with only warm water (not higher than 40°C).
3. To remove plaque, use a soft sponge with a drop of dishwashing agent. Never rub with hard brushes - this violates the tightness of sealing gums.
4. Dry all the elements thoroughly for at least 12 hours (preferably in the sun or near the heater).

The fine cleaning filter (HEPA) requires a special approach:

• 🚫 Do not wash it with water, as it destroys the fibers and reduces the filtration efficiency.
• 🪄 Use a vacuum cleaner with a narrow nozzle to remove dust from the surface.
• 🔄 Change the filter every 3-6 months (depending on the intensity of use).

⚠️ Warning: If the vacuum cleaner becomes worse after cleaning, check the sealing ring on the container lid. Over time, it deforms - in which case a replacement is required (Article for Mi Robot S50/S51: ZNMS01WM).

3. Cleaning of side and main brushes: remove wound hair and threads

The side brushes are the most vulnerable element of the Xiaomi Mi Robot, and their plastic gears wear out quickly if you don't remove the hair and fur of the animals, and in service centers, up to 40 percent of the calls are due to the failure of these brushes due to inadequate care.

Cleaning instructions:

1. Remove the side brush by pulling it down (on some models you need to press the retainer).
2. Remove hair from the axis of the brush and from the groove of the attachment. It is convenient to use a toothpick or tweezers.
3. Check the gear for chips. If the teeth are erased, it's time to change the brush. ZNMS02WM).
4. Clean the groove in the vacuum cleaner case from accumulated dirt - dust "congestion" often form here.

The main brush (roller) requires no less careful care:

• 🧶 Cut the wound threads and hair from both ends of the shaft with scissors.
• 🧼 Rinse the brush underwater, removing the sticky dirt between the bristles.
• 🔧 Check the bearings for backlash - if the roller dangles, it needs to be replaced.

For models with rubber blades (such as the Mi Robot S6), use silicone lubricant to restore elasticity. Over time, rubber loses flexibility and collects less debris from carpets.

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If the brush has started to slip (it doesn't rotate when you turn it on), check the belt of the drive. 70% of the time the problem is solved by lifting or replacing it (ZNMS03WM article).

Cleaning sensors and navigation systems: why the vacuum cleaner is “blind”

Xiaomi Mi Robot is equipped with a sophisticated navigation system that includes a laser rangefinder (LDS), infrared sensors and drop sensors, and polluting at least one of them leads to chaotic movement, skipping cleaning areas or a complete vacuum cleaner stop.

How to clean the sensors:

Pay special attention to the laser rangefinder. Its lens should be perfectly clean - even a fingerprint can distort the signal. To clean, use a microfiber wipe for optics (such are sold for smartphone cameras) and circular movements from center to edge.

⚠️ Warning: If the vacuum cleaner still goes blind after cleaning LDS, check the transparent window on the top cover. Over time, it gets cloudy from dust, in which case a replacement is required (the part comes with the new LDS- module).

5. Caring for wheels and suspension: why the vacuum cleaner "sluggish"

Xiaomi Mi Robot wheels have rubber treads that eventually become covered with a layer of dirt and lose traction, which leads to the fact that the vacuum cleaner begins to stall on smooth surfaces (tiles, laminate) or can not overcome the thresholds.

Step-by-step cleaning:

1. Turn the vacuum cleaner over and remove the wheels by pulling them down (on some models you need to turn 1 screw).
2. Remove hair and threads from the wheel axis – more dirt accumulates here than in brushes.
3. Wash the wheels with soap and water, then dry. To restore elasticity, wipe the rubber with silicone grease.
4. Clean the slots in the vacuum cleaner case - sand is often clogged here, which acts as an abrasive.

Check the vacuum cleaner suspension:

• 🔧 If the vacuum cleaner has started to "sink" on one side, examine the suspension springs (article ZNMS04WM).
• 🛠️ Grease the suspension hinges with lithium lubricant (1-2 drops for each joint).

For models with rubber tracks (such as Mi Robot Mop 2), use a special rubber cleaner to prevent cracking and extend the service life by 30-40%.

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If the wheels are cleaned, but the vacuum cleaner is still stalling, check the Hall sensors in the wheels' engines, and contamination causes the drives to malfunction.

Deep cleaning of ducts and fan

Over time, fine dust accumulates in the air ducts of Xiaomi Mi Robot, which forms dense traffic jams.

• 🔊 Increased noise during operation
• 💨 Reduced suction power
• 🔥 Engine overheating (emergency shutdown may be triggered)

How to clean the air ducts:

1. Remove the bottom cover of the vacuum cleaner (turning 4 screws).
2. Disconnect the flexible hoses leading from the dust collector to the fan.
3. Blow the hoses with a compressor or rinse with warm water and soap.
4. Clean the fan blades with a toothpick - the sticky dirt accumulates here.

For turbine-powered models (such as the Mi Robot S7) after cleaning, be sure to check the fan balance. If the blades are bent, this causes vibration and accelerated wear of the bearings.

⚠️ Warning: When disassembling ducts, don't pull the sensor wires -- in the Mi Robot, they're often soldered directly to the board. Wiring damage causes a 02-03-06 error (sensor communication break).

7. Prevention and regular maintenance

To make Xiaomi Mi Robot last longer, follow these guidelines:

• 📅 Clean the dust collector and filter after each 3-4 cleaning.
• 🧹 Clean your brushes and wheels once a week (if you have animals, every 3 days).
• 🔋 Store the vacuum cleaner at the charging station – this prevents the battery from being discharged to zero.
• 🌡️ Avoid cleaning at temperatures below +5°C, which harms the lithium-ion battery.

For models with wet cleaning function:

• 💧 Use only distilled water — ordinary leaves limestone plaque.
• 🧽 Wash the water tank after each use.
• 🧴 Add 1-2 drops of the disinfectant glass washing agent.

If the vacuum cleaner is used in a home with animals, install special wool filters (article ZNMS05WM) – these trap up to 99% of allergens and prolong the life of the main HEPA- filter.

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To remove persistent odors, put a bag of soda or activated carbon in the dust collector for 12 hours, which neutralizes the bacteria that cause the unpleasant odor.

Frequently asked questions