What to do if the Xiaomi Robot Vacuum S40C cannot remove stubborn stains while mopping?

If the Xiaomi Robot Vacuum S40C cannot remove stubborn stains while mopping, manual cleaning can be required for certain tough stains. It is also recommended to pre-soak stubborn stains with water before cleaning.
Here is more information about cleaning stubborn stains for your reference:
1. While the robot vacuum offers efficient mopping capabilities for everyday dirt and spills, it cannot fully remove certain stubborn or dried-on stains. The built-in mopping system is designed for light to moderate messes, using consistent water flow and even pressure to wipe surfaces;
2. For tough stains such as dried liquids, sticky residue, or grease, manual cleaning is more necessary to achieve a better cleaning effects. In such cases, it’s recommended to pre-treat the area with a suitable cleaner or wipe it manually before or after the robot’s cleaning cycle;
3. This ensures optimal floor hygiene and complements the robot’s automated performance. Regular maintenance and timely stain removal can also help prevent buildup and improve mopping effectiveness.