Depending on the lady, usually it just takes mild soap and water. I used to use lightly scented Vagisil, but over time it made it so if I didnt use it, I would get a yeast infection. @Kilt Boy is correct; using products such as Vagisil can negativity effect your Ph levels, causing problems like smell, over the long term.
I personally always recommend a sensual shower, if someone walks in with a disapproving smell. I always make sure I shower before hand, even if I take a shower with them later. Baby wipes and peeing immediately after can also help, limiting the amount of sweat and fluids building up.
BV (basically a really bad yeast infection, fishy odor) is also a very common thing. Once you've had it once, it's hard for your levels to go back to normal sometimes.
I also notice a different smell and secretion a few days before ovulation. So, it could just be bad timing. However, if it's a puneant fishy order... it's probably BV.