Oh please Ellwood! Ok, maybe not immediately before, the night before maybe?
If you're going to treat a WG like someone you've paid money too and therefore should try and get the most out of, this will not make for the nicest possible experience.
But if you treat the WG like the precious human being that she is, with lots of care and respect, most likely she will bend over backwards to ensure you have the best experience possible. Maintaining good hygiene is part of that respect!