How does the roller mop self-clean during mopping?

While mopping, the robot sprays a mixture of water and detergent through 12 holes to evenly clean the roller mop. After cleaning, a squeegee blade behind the mop removes dirty water, which is then sucked into the robot's wastewater tank. This ensures the mop is always clean when it touches the floor, effectively cleaning up milk, coffee, and other liquids on the floor.