All of the following cleaning and disinfection guidelines are true about combs and brushes, except:

Combs and brushes in a hairstyling environment require specific cleaning and disinfection protocols to ensure safety and hygiene. The guideline regarding the use of fine steel wool is not appropriate for disinfecting these tools. This is because fine steel wool can scratch and damage the surface of combs and brushes, potentially making it easier for bacteria and debris to accumulate in those scratches. Additionally, fine steel wool can leave behind particles that could irritate the scalp or hair.

In contrast, other methods mentioned are effective and standard practices. Using hot water can help in loosening product buildup before applying disinfectants. A disinfectant solution is typically necessary to effectively eliminate bacteria and viruses. Regular cleaning reinforces hygiene standards in salons, which is essential for client health and well-being.

Focusing on the correct cleaning methods is vital for maintaining the integrity of the hairstyling tools and ensuring that they do not compromise clients' health. Thus, using fine steel wool as a disinfecting method is not advisable, making it the exception among the listed guidelines.