The stranger 'sweeping' his eyes across the halls

This written piece is intended for the age group of 14-18 (teens who attend high school)
He walks down the hallways of the school from Monday to Friday. He is frequently seen after the lunch hour, cleaning up after the dirty students who leave their 'leftovers' lying around on the floor of E.Y.C.I. You know of his arrival by the jingling sound of the keys hanging from his left pocket of his pants. He 'sweeps' the floor with his eyes looking out for a sign of dirtiness and garbage.
He appears to be heading for the empty container that lies against a locker straight ahead in his direction. It seems that when he is done in this hallway, he may be headed onto a journey throughout the rest of the school to complete his job. He goes by the name of Bob, his last name unknown to all students. Probably not to be noticed, he blends in with the rest of the students of E.Y.C.I. He is seen wearing a solid blue E.Y.C.I long-sleeved sweater with dark blue long pants, similarly to the rest of the students in uniform. Bob is sometimes seen wearing gloves to avoid being in direct contact with germs and others food. To complete his outfit, he wears black solid shoes, that drag along in the hallways.
Bob's tall and thin body pushes in front of him a garbage trolley, where he collects the mess and garbage of the school. The young boy who looked up to him while walking in the English hall, only saw a grumpy, pouted expression on Bob's pale complexioned wrinkled face. This is not a surprise to the students as they are aware of the fact that Old Bob dislikes his job as a caretaker. The students often get the impression that Bob has low self-esteem and does not show any care in taking care of himself as he wears his hair in a ponytail and is unshaven.
Although Old Bob seems to dislike his occupation, he is left with no other choice. It is rumored throughout the school that Old Bob didn't have a good education while growing up as he choose to hang out with the 'wrong crowd'. Not much is known about Bob's parents, but is is also rumored that his mother abandoned him in his early teens.
What students and staff do know is that Old Bob has a family of his own, consisting of a wife, a son and himself. Once when Old Bob was doing his regular duties in the hallway, he bent down to pick up some garbage, that was when by accident his wallet fell out of his pocket and opened , lying on the ground was a clear picture of his wife, his son and him hugging in a family portrait. When a student nearby innocently asked him if that was his family, he in a grump tone replied; "Leave my family alone!", this was when it was known for sure.
It's given that the only reason Old Bob is still working as a caretaker, a job he despises, is so that he can support his family. Maybe he doesn't want his son to feel that his father doesn't care, as maybe his mother who supposedly abandoned him did. Watching Old Bob right now, pushing the garbage trolley in front of him with a grumpy expression, one thing is for sure, Old Bob does quite the job cleaning up after everyone. In contrast to the rest of the students, Old Bob walks the hallways in silence, remaining a stranger to everyone.