Britannica Dictionary definition of CLEAN–CUT. [more clean–cut; most clean–cut] : having a neat appearance that suggests you are someone who does not break rules or cause trouble. a polite, clean-cut young man.

A barber has to sanitize and disinfect his haircut tools every time, in between every customer. You want everything you use on your client to be clean, with no exceptions. It's also the law! The best ways to disinfect barber tools are spraying, dipping, and immersing them for 10 minutes in the disinfectant solution.