(EN) In order to recover the resources (cleaning agents heat) contained in the cleaning agent vapors suctioned off a cleaning system for cleaning industrially produced components according to the invention the suctioned off waste air (I) is guided in a recovery device (5) via a heat register (9) of a refrigeration device (6) is thereby substantially heated to the temperature of the waste air (I) and the thus heated dried waste air (I) is supplied to the cleaning chamber (2) in the region of a bulkhead door (16) as preheated dry supply air (II).