kitchen porter 
noun
A person employed to wash dishes and carry out other menial duties in the kitchen of a restaurant or hotel.It belonged to my dad and I drove it at the weekend to a posh country hotel, where I worked as a kitchen porter....
- He originally came from Bradford and worked at St William's College in York as a kitchen porter.
- During one of their meetings just a month before the blaze, he told her he was unhappy working as a kitchen porter following a disagreement with one of the chefs.