To provide a motorized cleaning apparatus (20), that is manually effective in adjusting the horizontal destance of a rotatable brush (21) from a facade according to its variable protrusions details. On each of the the right and left hands of a worker supporting chair, rails (24) are installed, supporting from the back balance blocks, and supporting from their top sides two slideable beams (26), holding a motor housing, which is linked from its front side to an intermediate shaft (30) via a supporting frame (31), a belt installed on a drive gear from the motor side drives the intermediate shaft (30), which is driving via its end gears the brush's shaft (39), using two toothed belts. To support the brush (21), its shaft is linked from its both ends to the intermediate shaft (30) through a two U-shaped joints (40), which are inserted inside the ends of the intermediate shaft (30) and the brush's shaft (39), wherein carrier bearings are installed in-between them.