Stable and sturdy sheet steel housing with built-in injection system (operated with compressed air) and collection container. The compressed-air gun and the injection system are actuated with a foot valve attached on the front side, so that only as much compressed air as required for the cleaning is consumed. The parts to be cleaned are simply blown off on the grating with the compressed-air gun. Portable like a sack truck with two wheels on the rear side. The injector system extracts all contamination downwards into a collection container which must be emptied on a regular basis