first, you need to use a .2% solution of hibiclens--that's 2/10 of 1%. At my local pharmacy, it sells in a bottle that is 4%, and at some hospitals I've seen hibiclens in packets also at 4%. This may be a common solution--but when you go to buy it, you need to look for what % solution it is. If you get 4%, then it needs to be diluted by 20times with water to get to .2%
The wash is a sort of low douche. You only need to rinse the lower regions of the vagina, which is where gbs hangs out. This is NOT a thorough 'high' douche that reaches the cervix, not at all. You could put the solution in a peribottle maybe, and then, using one set of fingers to hold your labia open, place the squirting end up to your yoni and squeeze it in. You could do this in the shower, maybe putting one foot on the edge of the tub to make for easier access.
As I said before, you only need to do this a time or 2 during the last week/s of pregnancy, and then once early labor.
But I do not worry about gbs. It should be enough to watch baby after the birth during the first days/weeks for signs of infection--just as we keep an eye on babies anyway in the early time, to be sure that all systems are 'go' and nothing strange arises when they are still transitioning to life outside the womb. Breathing, color, nursing, sleeping, alert periods, temp, peeing/pooping, general muscle tone/activity, rashes....
The greatest risks w/gbs come with babies born prior to 37 wks, babies that weigh 5lb or less, babies that have other problems going on anyway; also, if your water is broken for a period of days prior to birth. When babies are full term, well-nourished and generally healthy, the risk of infection low--the risk of death from infection even lower.