And how will you assume she is "cleaner" or "fresher" in the morning? Lots of baseless assumptions.
If cleanliness matters for a person it does not rely on the hour in the day, rather of what came before and what is coming next. For myself I always take a shower before going and an other quick one (paying attention to private parts) just before the deed.
At a massage parlors on my list, girls always shower after the encounter while I dress up, and they also go in the shower for their privates at the beginning of the encounter. They always taste "fresh". That is OK for me, I'm not expecting more.