No set rules for me.
One very nice Thai lady I know does a very erotic clean up with wipes and tissue, by the time she finishes I'm usually well worked up and ready to go again.
A Chinese lady I knew used to lead me from the bed to the shower and thoughly wash both of us, before towelling off and heading back to bed.
Another Chinese girl would have been a favourite of Sir Frank as she would clean you up with her tongue.
And another of my favourites just hand you wipes, tissues and leaves you to it.
I'm happy with the service from all.