the smell of an oily rag

ANDY'S COLLEAGUE: I'm going to Dux, anyone need anything?
ANDY: I might come with you.
ANDY'S COLLEAGUE: Alright. But only if you walk at least two metres behind me.
ANDY: I feel like an oily rag...
ANDY'S COLLEAGUE: [baffled] Why an oily rag?
ANDY: Well you don’t take an oily rag with you, do you?
ANDY'S COLLEAGUE: There's a lot of things you don’t take with you-!
ANDY: Yeah, but I’m not about to start listing them all, am I?