To provide a mobile floor-cleaning robot comprising a cleaning system. A mobile floor cleaning robot includes a robot body defining a forward drive direction, and the drive system, a cleaning system, and a controller in communication with the drive system and cleaning system. Cleaning system includes a pad holder having a bottom surface for receiving the cleaning pad, and a fluid applicator configured to apply the fluid to the floor surface. The controller controls the drive system and the fluid applicator while performing cleaning routine. Cleaning routine includes the steps of applying a fluid to a footprint area substantially equal to the floor area of ​​the robot, to moisten the cleaning pad with coating fluid, the center and side edges of the cleaning pad to the floor area separately in moving pattern for moving through and a step of returning the robot to the floor area. .FIELD 1