Disclosed is a method for validating a decontamination procedure performed using a decontamination system that comprises a first product for use in a first step of the procedure, such as a pre-clean step, and a second product for use in a subsequent second step of the procedure, such as a disinfection step. The method comprises capturing a video stream of a work area in which the decontamination procedure is carried out by a user, analysing the video stream to identify when the first product is present in the work area and when the second product is present in the work area, determining, based on said identification, that the first and second products have been presented in the correct order in the decontamination procedure, and causing a corresponding indication to be provided to the user. The method may include alerting the user to potential errors and/or logging data to provide an audit trail.