A manually manipulated and propelled apparatus to bear upon and to traverse the floor surface of a bowling alley lane for cleaning and conditioning thereof. The apparatus is characterized in that it includes a reservoir for a floor-treating liquid composition, a wiper assembly including a web for applying treating composition to the floor surface, and an improved liquid flow and feed system of conduits and flow regulating means to direct and to control the rate of delivery of liquid from the reservoir to the web. The web is advanceable stepwise, as required, to present new increments of web to engage the floor surface.