Automatic machines for cleaning outer wall of a high-rise building

A machine for cleaning outer wall of a high-rise building using pneumatic system to press said machine against a wall consists of:

• a case divided into at least 3 chambers vertically arranged having an opened-anterior side where edges of all said chambers having one of rubber plates and brushes mounted all along their rims;
• there mounted in an upper and a lower chamber a roller having its surface aligned with an edge of said rubber plates or brushes;
• at the back of each of said upper and lower chambers, there is a hollow tube mounted thereto with one end inside and the other end outside each chamber;
• within each hollow tube at the external part outside said case, there is a right-angled tube installed with its one end inside said hollow tube pointed away from said case and another end outside said hollow tube connected to an air pump in a manner that when said air pump is turned on, air is pumped outside said upper and lower chambers through the end of said right-angled tube inside said hollow tube to drive said machine in addition to create negative pressure within said upper and lower chambers resulting in pressing said machine against a wall to be cleaned;
• machine can move while cleaning by shifting a cable tied at the top of said case;
• in a middle chamber of said machine between the upper and lower chambers, there is a brush which can rotate to scrub a surface whose hair sticking out over the level of the edge of said rubber plates or brushes along the rims of the chambers, where at the back of said middle chamber there is tubing to eject water and/or detergent solution to said brush, and where said brush is motor-driven in cleaning said wall.