Apparatus for cleaning and/or sterilising plastic preforms, with a transport device which transports the plastic preforms along a predefined transport path, and with a plurality of actuation devices which actuate upon the plastic preforms with a flowable sterilisation agent, wherein the actuation devices are formed movably with the plastic preforms, characterised in that the actuation devices are arranged such that - they either inject the flowable medium into the plastic preforms under a predefined angle α different from 0° in relation to the longitudinal direction thereof in a way, that the injection direction also contains a component in a direction opposite to the transport direction of the plastic preforms or - a longitudinal direction of the actuation devices is in each case arranged behind the longitudinal directions of the plastic preforms, in the movement direction of the plastic preforms, wherein in this embodiment it is proposed that the individual actuation devices are offset to the rear in relation to their allocated plastic preforms in each case viewed in the transport device of the plastic preforms so that the actuation devices each trail their allocated plastic preforms in the movement direction of the plastic preforms and further wherein a respective longitudinally extending channel of an actuation device is arranged offset relative to the longitudinal directions of the plastic preforms, wherein the offset resulting from a distance (d) between the longitudinal directions of the plastic preforms, being parallel to each another, and the actuation devices. the actuation devices are formed movably with the plastic preforms, characterised in that the actuation devices are arranged such that - they either inject the flowable medium into the plastic preforms under a predefined angle α different from 0° in relation to the longitudinal direction thereof in a way, that the injection direction also contains a component in a direction opposite to the transport direction of the plastic preforms or - a longitudinal direction of the actuation devices is in each case arranged behind the longitudinal directions of the plastic preforms, in the movement direction of the plastic preforms, wherein in this embodiment it is proposed that the individual actuation devices are offset to the rear in relation to their allocated plastic preforms in each case viewed in the transport device of the plastic preforms so that the actuation devices each trail their allocated plastic preforms in the movement direction of the plastic preforms and further wherein - they either inject the flowable medium into the plastic preforms under a predefined angle α different from 0° in relation to the longitudinal direction thereof in a way, that the injection direction also contains a component in a direction opposite to the transport direction of the plastic preforms or - a longitudinal direction of the actuation devices is in each case arranged behind the longitudinal directions of the plastic preforms, in the movement direction of the plastic preforms, wherein in this embodiment it is proposed that the individual actuation devices are offset to the rear in relation to their allocated plastic preforms in each case viewed in the transport device of the plastic preforms so that the actuation devices each trail their allocated plastic preforms in the movement direction of the plastic preforms and further wherein a respective longitudinally extending channel of an actuation device is arranged offset relative to the longitudinal directions of the plastic preforms, wherein the offset resulting from a distance (d) between the longitudinal directions of the plastic preforms, being parallel to each another, and the actuation devices.