Patent ID: 8671506

Claim:
A washing device for removing contaminants and ink from a surface to be cleaned, comprising: an ultrasound device having at least one ultrasound generator and at least one resonator being an oscillating flat and substantially rectangular sheet metal body; a washing cloth having an inner surface and an outer surface, said inner surface contacting a bent away or rounded off portion of said resonator, such that in use, said washing cloth is positioned between said resonator and the surface to be cleaned; and said resonator being configured for pressing said washing cloth against the surface to be cleaned and outputting sound energy onto a substantially linear region on the surface to be cleaned when excited in the ultrasound range for producing oscillations, in a normal mode of vibration of an oscillating system extending substantially over a length of said metal body and having an oscillation direction being inclined at an angle between 10° and 70° relative to a surface normal of the surface to be cleaned in a line of contact of said washing cloth.