Yes!
Here's what I did:
I tested + for GBS at 37 weeks. My HB MW mentioned the possibility of using chlorhexidine (Hibiclens) washes during labor as an alternative to antbx.
So, I figured if Hibiclens does work, it should also be able to "work" to get a negative test result.
SO...about an hour before I restested, I did a gentle wash (mostly external, vaginal opening & anus) with 2/3 water & 1/3 hibiclens. Five days later I did another test, same way. Both were negative.
Now, I am not at all saying that my current status is neg, but it does seem like the Hibiclens worked for me to get a neg test result. Obviously you don't want to be using it on a regular basis, but for the sake of getting a neg test, it seems reasonable to me.
In the meantime I've also changed to a more expensive, super high quality intestinal probiotic AND a probiotic specifically targeting the vagina. I suppose that could have made a difference in the test, but I don't think I was on it long enough.
To me, the cool part about using Hibiclens for retesting is that you can do it super fast - some of the natural remedies may work for some folks, but it does seem hit or miss and it takes awhile. It also helped me feel confident about the use of Hibiclens in labor as an effective option.
Again, I'm not assuming my actual status is now neg. I suppose it could have returned, or a heavy colonization could be higher in my vagina or even have crossed the membranes. My understanding is that the last possibility is rare. My MW was not in favor of testing my urine, nor was I.
I plan to use Hibiclens in labor, unless my water is broken for a super duper long time in which case I will reconsider antbx. Testing neg was mostly important to me in case of a hospital transfer, since my MW will leave the antbx choice up to me.
I'm now 39 +5 and eagerly awaiting some action!!!
Good luck!