Final answer:
Drag brooms are not suited for single-surface treatments due to the risk of scratching surfaces with debris embedded in the broom from previous uses.
Step-by-step explanation:
Drag brooms are not recommended on single-surface treatments because they are intended for multiple uses and not for discarding after a single use. This is particularly important when considering the cleaning of delicate surfaces, such as those in optical components. In such instances, a wet cloth must be used once and then discarded to prevent the possibility of scratches caused by debris that has become embedded in the cloth from previous cleans.