Sal might be a germaphobe, or he might just have really sensitive skin. It's hard to say definitively without knowing him better, but there are some clues that suggest he might be a germaphobe. For example, he always has hand sanitizer with him and he's always wiping his hands on his clothes. He also Avoid shaking hands with people.
There's no shame in being a germaphobe. If Sal is one, he's probably just trying to protect himself from getting sick. Some simple tips for living with a germaphobe are to always have hand sanitizer available, and to try to avoid touching door handles, light switches, and other commonly touched surfaces. You should also avoid eating in front of them, and wash your hands thoroughly and frequently.
