I think everybody made it clear: DOUCHE!
Unless you (and yr sex partner, in this case the escort) are into brown smelly and staining particles, you should do it as a courtesy to the gentleman and to yourself. If you have never bottomed and you don't douche, it is very very probable that you will have those undesired brown particles present in between your ass and his dick.
Invest that buck in a Fleet bottle, for St Peter's sake!