Do not purchase any feminine wash. Those are filled with chemicals that most people cannot pronounce. If you wouldn't eat/drink it, why would you put it on the most sensitive part of your body? So say no to the FDS and the Summers Eve. They are all gimmicks.
When I was a teenager and I had questions about this my doctor gave me these tips and they've always worked:
1. Drink LOTS OF water -- it flushes your system out and helps with that kind of thing.
2. Use a bar of plain, unscented Dove soap, create a lather with your hands (not a wash rag-- they hold bacteria) and use it to wash your vaginal area daily. (also avoid scented tampons, those chemicals can create infections.)
3. If you aren't lactose intolerant/vegan eat YOGURT, its the best cure for good vaginal PH. Also sauerkraut and organic, unfiltered apple cider vinegar.
4. Avoid extremely tight pants and panties
5. Don't sit in wet bathing suits for long periods of time.
Pick up a feminine wash from the feminine hygiene aisle at the store. They are gentle enough to use everyday and they leave you with a light clean scent