Review (4/5): No more stains.
I have no idea how these work, but they do. We have a sweater in our house that is so bad it stains their arm pits of their clothes beyond being able to get the stains out. Now after one use and after a shower alot less sweat has shown. Still will have to ask the doctor if this is safe, but it is effective.
I purchased these for free or a discounted price to use, and to give my unbiased opinion.