If I am going to an interview for a custodian position at a big Distribution Center, should I dress up?

YES! You can never go wrong by dressing for any job interview. It shows you have some brains, taste, self-discipline, and you care about what people think. All of that equals pride---and those are qualities I want in a custodian and any other employee. You never offend someone by walking in with dress clothes, but you could turn someone off by showing up too sloppy. Who knows? They may see more potential in you and you may not stay a custodian long. Best to you.