- hand-washing with chlorhexidine using the standard 7-step technique. Pre-prepared sealed envelopes will be used. Participants allocated into hand hygiene protocols (1) and (3) will be asked to perform the hand hygiene method, as they normally would. Participants assigned to hand hygiene protocol (2) will be requested to perform hand-rubbing with alcohol, using the technique they would normally adopt for chlorhexidine hand-washing.