How do you keep your vagina smelling fresh?
This is actually a fallacy that a vagina must be "fresh". It is a body orifice with naturally occurring bacteria and a normal musky odor that is not offensive nor should be covered up with artificial scents. Bathing/showering with warm water is all that is needed as soaping/douching or spraying can cause imbalance in the normal bacterial flora and result in rashes, abnormal discharge or irritation.
If you have unusual odor that is "fishy" or ammonia-like or rotten egg smelling, then you may well have an infection that needs to be evaluated, especially if secretions are colored or highly irritated.