Easy. Spread it apart with your fingers and rinse it out with warm water. That's all you need.
Don't use soap or anything with fragrances, alcohols, or other irritants. Other than the fact that they're irritants and they dry out the vagina they can actually increase your chances of an infection.
No soap,no detergents,no body wash,no douches,no vinegar,no salt and no chemicals.Plain ole' water and your hands.
If you happen to get smegma,use a Q tip to get it out of the crevices and from under the clitoral hood.
Should you have a fishy/sour odor(not after you work out),then seek medical help from a gynecologist,it could be a yeast infection or Bacterial Vaginosis.If you have an odor just after working hard or working out and being physical,I wouldn't read into it too much.
Wear cotton panties,it allows your vaginal area to breath,if you have discharge,use a pantiliner.