It should smell fine and alluring by itself - if it smells disgusting, there might be:

- a medical issue that needs attention and that manifests itself in foul smell
- a perception issue in that your ideas (which are powerful - "a slimy gross hole" reflects the strength of your opinion because the metaphor uses strong words - "gross", "slimy", as opposed to, say, "unpleasant looking") influence your perception

Before you explore vaginal hygiene, it would make sense to first see a woman healthcare provider to rule out medical concerns, and then, should you get a clean bill of health from the woman healthcare provider, work with your perception/ideas (since they are all in your mind, you should be able to work on them on your own, without help).

If you do use vaginal hygiene products, you need to make sure that they match the pH of the vagina, or else horrible things can happen, since vaginal micro-flora is fragile and should not be disrupted. to the best of my knowledge, the only product line that sells vaginal products with the right pH in the States is sold by the Sweet Spot Labs:

Products

I use them (once a day in a shower if I take a shower that frequently, or, once every couple of days when I slack off) and they are fine - no irritation, no nothing. Before them, I used to bring products from Europe - in Italy they make those wonderful high foam white mousses for the vagina that have the correct pH - mmm.... feels much more luxurious than the liquid produced by the Sweet Spot Labs, but in terms of functionality, they work the same.

It probably also makes sense to eat lots of live culture yogurt and drink cranberry juice - the former to improve the flora and the latter to prevent UTI's. And, on the most general level, it would help to ensure that you are well hydrated - which is a good idea in any case, whether you are trying to have sex or prepare for a difficult exam. I can see how a body that is not properly hydrated might start producing foul smells.