I worked with a dude from Pakistan that thought Air Wick was cologne. He rubbed the wicks on his wrists. My boss thought he smelled good. I thought otherwise.
Some foreigners don't know they stink, their culture and hygiene habits must be different. We had one from Nigeria that would eat nothing but Sardines. I cannot even begin to describe the smell he put off when the odor was permeating from his skin, it was bad. Every supervisor I had refused to take him on a job due to the smell. After I called HR and asked them what my options were, I dealt with him. He said he had no clue he smelled any differently and would start taking a shower daily instead of after 3-4 jobs.
I worked at an office where we had these two Indian (dot) guys and they only showered once a week. They also walked to and from work up and down the DNT service road, and you can imagine how that got during the summer.
No one could stand to go near their cubicles, so the boss told them they were doing such great work that he was giving them an office. He stuck the two of them in a small unused storage room and told them to keep the door closed so no one else would distract them from their work.