detailer
noun [ C ]
US uk/ˈdiːteɪlər/ us COMMERCE, MARKETING (also detail person)
a person who visits a company's customers, to give them information about the company's products and to find out about the level of sales, etc.:
A pharmaceutical detailer promotes the use of, and sells, legal drugs and other pharmaceutical products to physicians, dentists, hospitals, etc.
TRANSPORT (also auto detailer)
a person whose job is to clean the inside and outside of cars