Which of the following can be used to remove buildup from a cool iron barrel?

Using a spray cleaner is an effective method for removing buildup from a cool iron barrel. These spray cleaners are specifically formulated to dissolve and break down residues, such as styling products, oils, and dirt that can accumulate on the surface of heated styling tools. They often contain ingredients that are safe yet powerful enough to clean without damaging the iron.

While other options might seem like plausible alternatives, they may not be as effective or safe for this specific purpose. For instance, soap and water could leave a residue if not rinsed thoroughly, while alcohol wipes might not provide the necessary cleaning power and could also dry out the tool if not used carefully. A vinegar solution, while it has cleaning properties, can be too acidic for certain surfaces and might lead to damage or corrosion on delicate materials. Thus, a dedicated spray cleaner is the optimal choice for maintaining the integrity and performance of a cool iron barrel.