Have you ever considered the difference between the two? I’m not sure what the real difference is, but it seems that I’m not the only one who gets mixed up. Traditionally, a janitor is entrusted with cleaning jobs, whereas a custodian is a person in charge of looking after a property or a child.
The confusion comes in because many janitors are seen performing other roles traditionally considered fit for a custodian. It seems a custodian is there on the premises of the property they are entrusted to maintain, whereas a janitor performs their duties in the morning or evenings. In the comparison, you can bring in the toilets, floors, security and changing of the light bulbs.
Still, very confusing…