Abstract: The invention relates to an apparatus (100) for treating one or more substrates with a multiplicity of solid particles comprising: a rotatably mounted drum (12) arranged to contain said multiplicity of solid particles and said one or more substrates during treatment of the one or more substrates; a collecting volume (22) for collecting said multiplicity of solid particles exiting the drum (12); a circulation path (L) for conveying said multiplicity of solid particles from the collecting volume (22) to the drum (12), the circulation path (L) having a downward portion in which the multiplicity of solid particles move along a downward flow path; a separating device (200) arranged in said downward portion of the collecting path for intercepting and/or capturing one or more foreign objects while permitting flow of said multiplicity of solid particles along the circulation path (L), the separating device (200) comprising: a sloping surface (202a, 202b) and a transfer flow path (208a, 208b) for said solid particles

Abstract: The invention provides an apparatus and method for use in the cleaning of soiled substrates, the apparatus comprising housing means comprising: (a) a stationary member; (b) a rotatably mounted cylindrical cage; and (c) access means, wherein said stationary member comprises an annular planar member which is of greater internal diameter than said access means and is located adjacent said rotatably mounted cylindrical cage and said stationary member comprises a multiplicity of delivery means which are mounted thereon and a multiplicity of orifices which are respectively operably connected to said multiplicity of delivery means, wherein said multiplicity of delivery means is adapted to facilitate the delivery of materials into said rotatably mounted cylindrical cage. The method involves cleaning the soiled substrate by treatment of the moistened substrate with a formulation comprising solid particulate cleaning material and wash water, the method being carried out using the apparatus of the invention.