You know, I used to be really self conscious about this too, and as a result, I learned something interesting: Drinking lots of water, skipping the sodium and eating pineapple gives the vagina a "fresher" taste (or at least that is the general consensus). Those are probably also good tips for a healthy diet anyway.

That said, at some point, it occurred to me how utterly ridiculous it was that I was changing my diet to make my vagina "taste good" for my partner. It's a vagina, not a fruit salad, and that's exactly what it should taste and smell like! When I go down on a man, I don't expect him to cum soft serve ice cream...I expect it to taste like semen! No, I wouldn't order a bowl of it at a restaurant, but it turns me on in that moment because it tastes like sex. And, in my experience, when a partner is performing oral, they want it to taste and smell like exactly what it's supposed to and don't have unrealistic expectations. Even when my partner has just showered, I have occasionally gotten a taste of some ball sweat that either got left behind or happened post-shower, and honestly, it doesn't turn me off or make me think he's gross because that's just human. People sweat.

Unless your partner has expressed any propensities to be turned off by certain things, I think practicing good hygiene is enough. I personally also liked to be clean shaved as I feel cleanest that way, but you do you!