A carriage designed for supporting a power washer wand and its nozzle a predetermined, though adjustable, distance from a surface which is to be cleaned by high velocity water exiting a discharge orifice of the nozzle. The carriage is defined by a one-piece body molded from substantially high strength synthetic polymeric/copolymeric plastic material. The carriage body includes a platform having a converging front end nose upwardly from which projects a wand support having a channel in which a power washer wand is located and adjustably clamped. The platform includes two wheels at a rear end thereof and a single wheel beneath the front end nose.