It's a very good idea to get her good and cleaned up before embarking on any serious cunnilingus. Take a shower or bath and make sure to thoroughly wash and rinse the vaginal lips, the clitoris (wash under the hood) and the vaginal opening. Not only can this be very pleasurable, it will greatly enhance the experience for both parties. She'll no longer have to worry about her body and you'll certainly benefit from the cleaning.

Afterward, both of you can end up pretty messy so it's important to clean up right away. Cunnilingus juices do not age well with time, so make sure to thoroughly wash all of them off your bodies. It's also a good idea to brush your teeth and/or rinse with mouthwash. Make sure to get any straggling pubes that may have wedged their way in between you teeth.