outside cleaner - grand father in from previous owner

[Jin Kim]

A son of tenant(section 8) has been getting paid $100 per month from the previous owner to sweep and do the garbage duties once a week. but I found that he does garbage, but not sweep. also he accumulated LOTS OF HIS JUNKS in the laundry room, and basically uses as his storage room. What is the best way to iron out this situation. He became my first headache since the acquisition.