Autonomous surface cleaning robot for wet and dry cleaning

A surface treatment robot, comprising:

• a robot body having an outer perimeter formed substantially as a shape of constant width,
• at least two circulating drive members that drive the robot body forward and steer the robot body;
• a dispensed fluid compartment that holds fluid to be dispensed by the robot;
• and
• a powered scrubber that drives at least one scrubbing element to clean, with the assistance of dispensed fluid, substantially along a line of maximum width of the shape of constant width, the driven scrubbing element extending to substantially within 1 cm of a tangential edge of the robot body.

A surface treatment robot, comprising:

• a robot body having an outer perimeter formed substantially as a shape of constant width, driven forward by at least one rotating member;
• a dispensed fluid compartment that holds fluid to be dispensed by the robot;
• a powered wet cleaning head that employs at least one powered wet cleaning member to clean a cleaning width along a cleaning width line of the robot with the assistance of dispensed fluid;
• and
• a waste material compartment that holds waste fluid picked up by the robot;
• the wet cleaning head having a cleaning width with respect to total robot mass of the robot body, dispensed material compartment when empty, wet cleaning head, and waste material compartment when full of waste fluid picked up by the robot, of more than or equal to three centimeters of cleaning width per kilogram of total robot mass.