First of all, I actually I wonder why it is referred to as "Bleach stains" because it is not so much a stain than the color of the garment being dissolved by the bleach.
But a co-worker of mine was wearing a light Denim-blue colored one-piece jumpsuit and accidentally spilled a large drop of bleach near the collar part of the suit. The bleached area turned pink. She asked me if alcohol would remove it. I told her that bleach actually does not really stain a garment but removes the color and that there may be no way to "reverse" the damage because the color has been removed by the bleach.
If there is a way to "remove bleach stains" please let me know so I can tell my co-worker. But otherwise it seems that the entire garment may have to be dyed all over again. It should be professionally done for best results. Do regular cleaners deal with such things? Anyone know of clothing "repair" services that can dye a garment damaged by bleach?