Vaginal health/odor

I've had an on going battle with vaginal odor for quite some time. It comes and goes. I've been to to the gyno time and time again, prescribed antibiotics, tested for bv and yeast.. Nothing ever comes back. The nurse last time told me I could just naturally have an odor but I feel it shouldn't be as strong as it is sometimes. Maybe my pH balance keeps getting thrown off??? I try just using water.. No harsh chemicals.. Changed laundry soap, boric acid suppositories. Anyone have tips on toning down odor? :/