I agree with LindaSays... I also have had to deal with persistant yeast/bacterial infections, for which I use boric acid. However, I've tried using boric acid on my armpits and it doesn't melt and it doesn't work on my armpits. It's definitely the biofilms (I believe) that are hard to break. If I use a towel twice, the towel starts to smell. Same for my clothes. I always have to buy new shirts because I can't take the smell out of the ones I have no matter what I do (alcohol, hydrogen peroxide,etc.). I wish we could find a solution to break the biofilms.