Surface cleaning head and surface cleaning device

A surface cleaning apparatus including a surface cleaning head movable along a surface to be cleaned, a cleaning liquid delivery system having a cleaning liquid tank, and a dirty liquid recovery system having a suction source and a recovery tank, wherein the surface cleaning head comprises:

• a housing;
• a suction pathway located within the housing;
• a brush chamber provided at a forward portion of the housing in fluid communication with the suction pathway and having a lower opening facing the surface to be cleaned and a laterally outward side opening;
• and
• a brush assembly removably mounted in the brush chamber and comprising a connecting wall, a cleaning roller and a side brush, the connecting wall removably connected to the housing and covering at least a portion of the side opening, the connecting wall having an inside surface and an outside surface, an end of the cleaning roller mounted on the inside surface and the side brush mounted on the outside surface, the cleaning roller driven by a drive device to rotate around a transverse axis, wherein the side brush is mechanically coupled to the cleaning roller to follow the cleaning roller around the transverse axis.