In the handbook there is a page that says personal grooming is not part of our third place.
Ask your boss. Have the SM warm him if your supervisor doesn’t feel comfortable. Hopefully over time after asking him enough times you can have him ban.

You can tell him "It costs nothing to be nice! Coffee, however, costs money."

Bro we have a customer who comes in at least every other day to "bathe" themselves in the bathroom. They're definitely not rude about things like your boy is, but I definitely feel for you.