Patent ID: 8661598

Claim:
An apparatus configured to clean a facade while moving along a building and using a recirculation cleaning system, the apparatus comprising: a structural frame; a thrust provider for generating force to keep the apparatus in contact with the facade; a close loop circuit of fabric sheet to wipe clean the facade; a high pressure water pump that discharges pressurized cleaning liquid into the fabric sheet via spraying nozzles; squeezing rollers where the fabric sheet runs in-between the rollers to extract cleaning liquid from the sheet; a collecting tray placed underneath the squeezing rollers and the spraying nozzles to gather squeezed and sprayed cleaning liquid; a reservation water tank that supplies cleaning liquid to the high pressure water pump; a filtration unit to filter cleaning liquid gathered by the collecting tray wherefrom a small water pump sends it to the reservation water tank; retractable arms that extend towards the façade to put the fabric sheet in contact with façade; a hoist unit to provide vertical movement for the apparatus; and a wire rope suspending the apparatus from the top of building.