Anybody hired serving staff?

Our venue is self catering, we hire all our own crockery and stuff (bar is provided with bar staff) and were thinking of proving the catering ourselves to save money but we don't want to be clearing and washing plates on our wedding day so we want a couple of staff members to clear the plates, wash up and tidy down the kitchen so that it's one less thing for us to clear at the end of the night, but we can't find anyone that does this. Has anyone done anything similar? And did you find a company that provides staff for a one off event?