What is the key disadvantage of manual scrubbing?

The key disadvantage of manual scrubbing involves the increased risk of injury to the clinician. This method typically requires the use of sharp instruments and can lead to cuts or punctures if not handled carefully. Since manual scrubbing often involves repetitive motions and maintaining control over cleaning tools, there is a heightened potential for accidents that could result in injuries.

In comparison to this option, other disadvantages, such as being time-consuming or the requirement of special cleaning solutions, while relevant, do not pose the same immediate physical risk to the clinician. Similarly, although manual scrubbing has limitations in thoroughly removing all microorganisms, the focus on the physical safety of the clinician emphasizes the significance of the injury risk inherent in this procedure.