Abstract: There is provided a method and apparatus for selective removal of materials present on an object A in one or more layers B by surface abrasion by projection onto the surface of the object A of a moving fluid composed of a gas and solid particles conveyed in the gas. The apparatus comprises at least two reservoirs (11,13,15) for solid particles (21,22,23 ) of at least two different sizes communicating with a single reservoir 30 trough conduits (24,25,26). Each conduit (24,25,26) has an obturator(27,28,29) movable between open and closed positions and the single reservoir (30) is connected to a further conduit (36) provided with a nozzle (37) situated in the proximity of the surface layer B to be stripped. Particles (31) are mixed in “T” joint(34) with gas from an air compressor (35) and directed out of the nozzle (37).