What is a common tool used by chimney sweeps for cleaning flues?

Wire brushes are an essential tool for chimney sweeps because they effectively remove soot, creosote, and other debris from the flue walls. The bristles of the wire brushes can reach into the nooks and crannies of the chimney, scrubbing away the buildup that can pose fire hazards and reduce the efficiency of the heating system.

In contrast, while hoops and ladders are important for accessing the chimney safely, they do not serve the direct purpose of cleaning flues. Vacuum cleaners can be used for post-cleaning cleanup but are not the primary tool for removing deposits from the flue itself. Pressure washers, on the other hand, are generally not suitable for cleaning chimney flues as the force of the water could damage the flue lining or create leaks. Thus, wire brushes stand out as the most effective and necessary tool for the task of cleaning flues.