A pressure type pool cleaner includes a head (10) propelled forwardly (34) over a surface (12). Different portions of water pumped (14, 16) to the head inducts debris into a cleaner system, and is ejected via a thrust nozzle (42) onto a deflector (68) and thence along a thrust line (80) to thrust the head along the line (80). The deflector (68) is pivotal via a saddle (48) about a longitudinal axis such as to be displaced laterally relative to the thrust nozzle (42). The deflector includes obliquely opposed deflection surfaces which are respectively aligned with the nozzle in dependence on its relatively laterally displaced position to deflect the water ejected along the line (80) to respectively different oblique directions to adjust the direction of thrust and to effect lateral steering.