A portable tool has a long handle with a fitting for connection to an external pressurized water supply, a hand receiver on the worker end of the handle with a trigger-operated water flow control valve, a rotatable wheel at a distal end of the handle remote from the control and having surface scrubbing elements thereon, a distribution nozzle pivotable in the handle adjacent the wheel to direct high velocity water discharge onto the scrubbing elements, a discharge direction control button adjacent the proximal end, and a control wire coupled to the nozzle and button and operable to direct discharge from the nozzle onto the wheel at selectable radii relative to the wheel rotational axis to change wheel speed, direction and torque.