Open Question: customer service , but protecting the business owner..?

if a customer walks in to a restaurant & the restaurant is a small location, & a customer walks in but his odor is extreamly bad, & sometimes smells like swet really bad other times comes in & smells like vEEEERy strong medicine, so bad other customer get up & leave , is there anything that person could be told with out risking the owner of the restaurant or the employee getting fired or sued? the man isnt a homeless he drives a car dresses with normal clothes but his oder is horrible! so bad owners loose business when hes in the shop