My barracks room feels impossible to clean

Just moved into the barracks in schofield. It's apparent that my new roommate used the empty room to store they're unwanted items, trash, and anything else you can imagine. Trash bags in the closet stains on the floor and a musty smell i cant explain. I have mopped three times and have scrubbed the door handles.

How do I get rid of these uneven yellow floor stains? It also just smells awful. Before I find myself the nearest desperate spouse to be.

To those who have been here before do i need a dehumidifier so I can prevent the mold from getting worse? Any advice would be great.